Angelina Jolie reveals two of her daughters underwent surgery recently

Angelina Jolie has revealed her two eldest daughters have both undergone surgery in the past two months.

The actress and director - who has three adopted children and three biological children with ex-husband Brad Pitt - opened up about their suffering and bravery in an essay for Time magazine to mark International Women's Day.

Jolie, 44, revealed Shiloh, 13, has had hip surgery, while Zahara, 15, has undergone multiple operations for an undisclosed medical condition.

READ MORE: Angelina Jolie credits children for giving her 'strength'

ROMA, ITALY - 2019/10/07: Angelina Jolie (C) and her children Shiloh Nouvel Jolie-Pitt and Zahara Marley Jolie-Pitt attend the European Premiere of the film Maleficent - Mistress of Evil. (Photo by Andrea Staccioli/LightRocket via Getty Images)

The Maleficent star wrote: "I have spent the last two months in and out of surgeries with my eldest daughter, and days ago watched her younger sister go under the knife for a hip surgery.

"They understand that going through medical challenges and fighting to survive and heal is something to be proud of.

"I also watched them face their fears with a resolute bravery. We all know that moment when no one else can help us, and all we can do is close our eyes and breathe. When only we can take the next step or breathe through the pain, so we steady ourselves and do it."

Jolie revealed youngest daughter Vivienne, 11, "studied the nurses with her sister, and then assisted the next time."

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LONDON, UNITED KINGDOM - 2019/10/09: Angelina Jolie attends the Maleficent: Mistress of Evil European Premiere at the BFI Imax, Waterloo. (Photo by Gary Mitchell/SOPA Images/LightRocket via Getty Images)
LONDON, UNITED KINGDOM - 2019/10/09: Angelina Jolie attends the Maleficent: Mistress of Evil European Premiere at the BFI Imax, Waterloo. (Photo by Gary Mitchell/SOPA Images/LightRocket via Getty Images)
LONDON, ENGLAND - OCTOBER 10: Angelina Jolie attends a photocall for "Maleficent: Mistress of Evil" at Mandarin Oriental Hotel on October 10, 2019 in London, England. (Photo by Mike Marsland/WireImage)
HOLLYWOOD, CA - NOVEMBER 05: Angelina Jolie and Brad Pitt attend the premiere of "By the Sea" at the 2015 AFI Fest at TCL Chinese 6 Theatres on November 5, 2015 in Hollywood, California. (Photo by Jason LaVeris/FilmMagic)
LONDON, UNITED KINGDOM - 2019/10/09: Angelina Jolie attends the Maleficent: Mistress of Evil European Film Premiere at the Odeon IMAX Waterloo in London. (Photo by Keith Mayhew/SOPA Images/LightRocket via Getty Images)
LAS VEGAS, NV - MARCH 25: (EDITORS NOTE: This image is a re-crop of original file 480515285) Angelina Jolie speaks onstage during the Universal Pictures presentation at Cinemacon 2014 - Day 2 held at The Colosseum at Caesars Palace on March 25, 2014 in Las Vegas, Nevada. (Photo by Michael Tran/FilmMagic)
Actor James Coburn and Actress Angelina Jolie attend the 72nd Annual Academy Awards on March 26, 2000 at Shrine Auditorium in Los Angeles, California. (Photo by Ron Galella, Ltd./Ron Galella Collection via Getty Images)
Actress Angelina Jolie attends Fifth Annual Screen Actor's Guild of America Awards on March 7, 1999 at the Shrine Auditorium in Los Angeles, California. (Photo by Ron Galella, Ltd./Ron Galella Collection via Getty Images)
Actress Angelina Jolie attends the world premiere of "Girl Interrupted" on December 8, 1999 at the Cinerama Dome Theater in Hollywood, California. (Photo by Ron Galella, Ltd./Ron Galella Collection via Getty Images)
Actress Angelina Jolie attends the world premiere of "Gone In 60 Seconds" on June 5, 2000 at Mann Theater in Westwood, California. (Photo by Ron Galella, Ltd./Ron Galella Collection via Getty Images)
Actress Angelina Jolie and Billy Bob Thornton attend the world premiere of "Gone In 60 Seconds" on June 5, 2000 at Mann Theater in Westwood, California. (Photo by Ron Galella, Ltd./Ron Galella Collection via Getty Images)
Actress Angelina Jolie and Billy Bob Thornton attend the world premiere of "Gone In 60 Seconds" on June 5, 2000 at Mann Theater in Westwood, California. (Photo by Ron Galella, Ltd./Ron Galella Collection via Getty Images)
Actress Angelina Jolie and actor James Haven attend Fifth Annual Broadcast Film Critics Association Choice Awards on January 24, 2000 at the Beverly Hills Hotel in Beverly Hills, California. (Photo by Ron Galella, Ltd./Ron Galella Collection via Getty Images)
Actress Angelina Jolie attends the world premiere of "Gone In 60 Seconds" on June 5, 2000 at Mann Theater in Westwood, California. (Photo by Ron Galella, Ltd./Ron Galella Collection via Getty Images)
Actress Angelina Jolie and actor Brendan Fraser attend 55th Annual Golden Globe Awards on January 18, 1998 at the Beverly Hilton Hotel in Beverly Hills, California. (Photo by Ron Galella, Ltd./Ron Galella Collection via Getty Images)
Actor Jon Voight, son James Haven and Angelina Jolie attend 25th Anniversary Screening of "Midnight Cowboy" on February 16, 1994 at the Director's Guild Theater in Hollywood, California. (Photo by Ron Galella, Ltd./Ron Galella Collection via Getty Images)
Actresses Angelina Jolie, left, and Michelle Pfeiffer pose during the photo call for the European premiere of the movie Maleficent: Mistress of Evil, in Rome, Monday, Oct. 7, 2019. (AP Photo/Domenico Stinellis)
UNHCR's special envoy Angelina Jolie walks after delivering her speech at an United Nations-run camp in Maicao, Colombia, on border with Venezuela, Saturday, June 8, 2019. Jolie visited the camp to learn more about the conditions faced by Venezuelan migrants and refugees and raise awareness about their needs. (AP Photo/Fernando Vergara)
UNHCR's special envoy Angelina Jolie meets with Venezuelan migrants at a United Nations-run camp in Maicao, Colombia, on border with Venezuela, Saturday, June 8, 2019. Jolie visited the camp to learn more about the conditions faced by migrants and refugees and raise awareness about their needs. (AP Photo/Fernando Vergara)
Angelina Jolie, United Nations High Commissioner for Refugees special envoy, address a meeting on U.N. peacekeeping at U.N. headquarters, Friday March 29, 2019. (AP Photo/Bebeto Matthews)
Angelina Jolie attends the LA premiere of "Dumbo" at the Dolby Theatre on Monday, March 11, 2019, in Los Angeles. (Photo by Richard Shotwell/Invision/AP)
Angelina Jolie durante una conferencia de prensa en el campo de refugiados de Kutupalong en Cox's Bazar, Bangladesh, el martes 5 de febrero de 2019. Casi 700.000 musulmanes rohingya de Myanmar viven en campos de refugiados en Cox's Bazar tras huir de la violencia militar contra ellos en su país. (Foto AP)
Actress and humanitarian Angelina Jolie attends a service marking the 200th anniversary of the Most Distinguished Order of St Michael and St George, at St. Paul's Cathedral in London, Thursday June 28, 2018. (Leon Neal/PA via AP)
Special Envoy of the United Nations High Commissioner for Refugees (UNHCR), Angelina Jolie, gives a press conference in the Domiz camp for Syrian refugees, near the town of Dohuk, northern Kurdistan, Iraq, Sunday, June 17, 2018. (AP Photo/Claire Thomas)
Angelina Jolie posa a su llegada a los Premios BAFTA 2018 en Londres, el domingo 18 de febrero de 2018. (Foto Vianney Le Caer/Invision/AP)
Angelina Jolie attends the 2018 American Society of Cinematographers Awards at the Dolby Theatre on Saturday, Feb. 17, 2018, in Los Angeles. (Photo by Richard Shotwell/Invision/AP)
La enviada especial de la agencia de refugiados de la ONU y actriz Angelina Jolie posa con una niña siria durante su visita al campamento de refugiados de Zaarari en Mafraq, Jordania, el 28 de enero de 2018. (AP Foto/Raad Adayleh)
Angelina Jolie, from left, Shiloh Jolie-Pitt, Zahara Jolie-Pitt and Loung Ung attend the National Board of Review Awards Gala at Cipriani 42nd Street on Tuesday, Jan. 9, 2018, in New York. (Photo by Evan Agostini/Invision/AP)
En esta foto del 7 de enero del 2018, Angelina Jolie luce aretes de Forevermark Diamond para la 75ta entrega anual de los Globos de Oro, en Beverly Hills, California. (Foto por Jordan Strauss/Invision/AP, Archivo)
FILE - In this Nov. 11, 2017 file photo, French film director Agnes Varda, left, accepts her honorary Oscar as presenter Angelina Jolie applauds at the 2017 Governors Awards in Los Angeles. Varda received an honorary Academy Award recognizing her decades of filmmaking. She also shares the documentary feature Oscar nomination for “Faces Places” with her co-director, JR, and her producer daughter, Rosalie Varda. (Photo by Chris Pizzello/Invision/AP, File)
Angelina Jolie, winner of the Hollywood foreign language film award for "First They Killed My Father: A Daughter of Cambodia Remembers," poses in the press room at the Hollywood Film Awards at the Beverly Hilton hotel on Sunday, Nov. 5, 2017, in Beverly Hills, Calif. (Photo by Jordan Strauss/Invision/AP)
Actress Angelina Jolie, right, arrives for a meeting with United Nations Secretary-General Antonio Guterres, Thursday, Sept. 14, 2017 at United Nations headquarters. (AP Photo/Mary Altaffer)
(FILES): This May 20, 2008 file photo shows US actors Brad Pitt (L) and Angelina Jolie (R) leaving the Festival Palace after attending the screening of US actor and director Clint Eastwood's film 'The Exchange' at the 61st Cannes International Film Festival in Cannes, southern France. Hollywood star Angelina Jolie has given birth to healthy twins, a girl and a boy, in the French Riviera maternity clinic she has checked into, the Nice-Matin newspaper reported Sunday, July 13, 2008, quoting her gynaecologist. The twins, Knox Leon and Vivienne Marcheline, were born shortly before 8:00 pm (1800 GMT) on Saturday, July 12, 2008, the paper said quoting gynaecologist Michel Sussmann. Jolie is fine after having a Caesarian section, it added. AFP PHOTO / FILES / Valery Hache (Photo credit should read VALERY HACHE/AFP via Getty Images)
(FILES): This September 18, 2007 file photo shows US actors Brad Pitt and Angelina Jolie arriving for the US premiere of "The Assassination of Jesse James", starring Pitt as the US outlaw-cum-legend, in New York. Megastar couple Angelina Jolie and Brad Pitt and their four children have traveled to the south of France where they will stay for some time, People magazine reported online April 30, 2008. It cited an unidentified source who said Jolie, who is newly pregnant, arrived in Nice late April 27, 2008 with her family, two nannies and three bodyguards and then drove to a seaside villa in Saint Jean Cap Ferrat, on the cote d'Azur. Although gossip columns say Jolie is pregnant with twins and plans to give birth in France, People magazine made no reference to the rumors. Jolie, 32, and Pitt, 44, are adoptive parents of Maddox, six, from Cambodia; Pax, four, from Vietnam, and Zahara, three, from Ethiopia. Their first birth daughter, Shiloh, was born May 2006 in Namibia. AFP PHOTO / FILES / Emmanuel DUNAND (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)
Swakopmund, NAMIBIA: (FILES) In this file photograph dated 07 June 2006, Hollywood couple Angelina Jolie (R) and Brad Pitt gives a press conference at a Swakopmund hotel after Hollywood's hottest couple became the proud parents of daughter Shiloh Nouvel Jolie-Pitt on May 27 in Namibia. Angelina Jolie and Brad Pitt have arrived in Pune, India for the shooting of a movie based on the murder of Wall Street Journal correspondent Daniel Pearl, reports confirmed 07 October 2006. The couple are expected to spend a month in western India for the shooting of "A Mighty Heart", based on the eponymous book by Pearl's widow about his abduction and killing by Islamic militants in Pakistan in 2002. AFP PHOTO/STR/FILES (Photo credit should read STR/AFP via Getty Images)
FILE - In this Jan. 15, 2007, file photo, actor Brad Pitt and actress Angelina Jolie arrive for the 64th Annual Golden Globe Awards in Beverly Hills, Calif. Angelina Jolie Pitt and estranged husband Brad Pitt have reached a custody agreement regarding their six children, according to a statement released by a representative of the actress Monday, Nov. 7, 2016. (AP Photo/Mark J. Terrill, File)
Photo by: Victor Malafronte/STAR MAX/IPx 2007 9/18/07 Brad Pitt and Angelina Jolie at the premiere of "The Assassination of Jesse James by the Coward Robert Ford". (NYC)
Photo by: KGC-11/STAR MAX/IPx 2011 12/8/11 Brad Pitt and Angelina Jolie at the premiere of "In the Land of Blood and Honey". (Los Angeles, CA)
Photo by: DP/STAR MAX/IPx Brad Pitt and Angelina Jolie at the premiere for Inglourious Basterds held at the Palais des Festivals. Part of the 62nd Festival de Film, Cannes.
Photo by: DP/AAD/STAR MAX/IPx 2007 11/11/07 Brad Pitt and Angelina Jolie at the premiere of "Beowulf". (London, England)
Photo by: NPX/STAR MAX/IPx 2008 2/2/08 Brad Pitt and Angelina Jolie at the Santa Barbara Film Festival. (Santa Barbara, CA)
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While her sons, Maddox, 18, Pax, 15, and Vivienne's twin Knox, 11, "were there for them, supportive and sweet."

READ MORE: Brad Pitt shares his reaction to Jennifer Aniston reunion hysteria

In February the children's father Brad Pitt, 56, was absent from the Bafta film awards in London, leaving co-star Margot Robbie to collect his Best Supporting Actor award for his performance in Quentin Tarantino's Once Upon a Time in ... Hollywood. It has now been speculated that Pitt's absence was because he was supporting his daughters as they recovered from surgery.

Jolie filed for divorce from partner of 12 years Pitt back in September 2016.

Last year Maddox, broke his silence on his relationship with his father three years after their alleged altercation.

When asked if his relationship with Pitt was "over" the teenager, who is currently a student at Yonsei University in South Korea, said: "Whatever happens, happens."

This article originally appeared on Yahoo UK
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