Brooke Kinsella has marked the first month of "chaos and magic" after the birth of her daughter Elsie.
The former EastEnders actress gave birth to her baby daughter three weeks early, on September 22.
Sharing a photo of the newborn, she wrote: "One whole month of utter chaos and magic. Thanks for choosing us Elsie."
Kinsella previously revealed her daughter was due on October 13, sharing another snap of the new arrival and writing: "Crazy to think you were only due to come into the world today little one..."
Kinsella married her long-term partner Simon Boardley in 2017.
Announcing the new arrival, she wrote on Instagram: "And then there was you... Elsie Rose Georgia Boardley.
"Stole our hearts immediately and forever at 1.07am on 22.09.2020."
Kinsella has been an advocate against knife crime since her brother Ben was stabbed to death in June 2008 when he was 16.
Earlier this year she marked the anniversary, writing: "This night 12 years ago, our beautiful Benjamina left home to celebrate finishing his GCSE's and never came home again.
"We loved Ben so very much – he was precious to us. He is never far from our thoughts, in the wonderful artwork and writing that he left us, a piece of music, a glimpse at photos, seeing his friends, in the faces of his beautiful nephews.
"The memories are all there. We often talk about what he would be doing now, should be doing now and sometimes, when its quiet, the feelings of missing him overwhelm us like a tidal wave.
"We have learnt to cope with losing him. It's part of grieving and the healing process. But it never really leaves you. We will miss him forever."
Eastenders actors Brooke Kinsella and Christopher Parker during their guest appearance on MTV's TRL UK at the MTV Studios in Camden, north London. (Photo by Anthony Harvey - PA Images/PA Images via Getty Images)
EastEnders actresses Michelle Ryan and Brooke Kinsella arriving for the recording of 'TV Moments 2002' at BBC TV Centre in West London. (Photo by Andy Butterton - PA Images/PA Images via Getty Images)
LONDON - FEBRUARY 8: Eastenders Stars (Left to Right) Joseph Swoosh, Brooke Kinsella & Christopher Parker attend the Mad Hatter's Tea Party - the London Taxidrivers Fund for Underprivileged Children's annual bash for 650 special needs kids - at Grosvenor House on February 8, 2004 in London. (Photo by David Westing/Getty Images)
LONDON - MARCH 23: Christopher Parker and Brooke Kinsella seen out walking while taking a break from filming Eastenders March 23, 2004 in Elstree London. (Photo by Paul Ashby/Getty Images)
LONDON - FEBRUARY 8: Eastenders Star Brooke Kinsella & Joseph Swoosh attend the Mad Hatter's Tea Party - the London Taxidrivers Fund for Underprivileged Children's annual bash for 650 special needs kids - at Grosvenor House on February 8, 2004 in London. (Photo by David Westing/Getty Images)
LONDON - OCTOBER 28: Actress Michelle Ryan and Brooke Kinsella pose at the National Television Awards 2003 held at the Royal Albert Hall on October 28, 2003 in London. (Photo by Dave Hogan/Getty Images)
Actress Brooke Kinsella from Eastenders arrives for the annual Passions Of Barbados Ball in aid of the Elton John AIDS foundation at the Natural History Museum in London. (Photo by Yui Mok - PA Images/PA Images via Getty Images)
LONDON - SEPTEMBER 30: (L-R) Lisa Snowdon, Michelle Heaton and Brooke Kinsella attend the "Stars Behind Bars" event at Millbank Lounge at the City Inn Hotel on September 30, 2004 in London. (Photo by David Westing/Getty Images)
LONDON - AUGUST 17: (L-R) Actresses Pooja Shah, Scarlett Johnson and Brooke Kinsella attend the afterparty following the UK Premiere of "Dodgeball: A True Underdog Story" at Sound Leicester Square August 17, 2004 in London, England. (Photo by David Westing/Getty Images)
Brooke Kinsella during "Shall We Dance?" London Premiere - Arrivals at Odeon West End in London, Great Britain. (Photo by Tim Whitby/WireImage)
John Mccririck, Brooke Kinsella, Jean-Christophe Novelli & Nikki Sanderson Attend The Launch Of The Maxim King Of Poker Tournament At Pacha In London. (Photo by Justin Goff\UK Press via Getty Images)
LONDON - JUNE 30: (L-R) Family members of Ben Kinsella, Brooke (sister) and Deborah (mother), visit the location where it is believed the sixteen year old boy was killed in the early hours of Sunday morning, to lay flowers and read tributes on June 30, 2008 in London, England. Ben Kinsella was fatally wounded in a knife attack, making him the 17th teenager to have been murdered in London this year. (Photo by Cate Gillon/Getty Images)
BARKING, UNITED KINGDOM - JUNE 30: Brooke Kinsella (L) consoles her sister Georgia, during a police press conference appealing for more information on their brother's murder on June 30, 2008 in Barking, England. Ben Kinsella, the brother of soap actor Brooke Kinsella, was fatally wounded in a knife attack, making him the 17th teenager to have been murdered in London this year. (Photo by Daniel Berehulak/Getty Images)
Actress Brooke Kinsella joins Shelter to launch the first ever comprehensive web-based housing advice service and 'Know Your Rights' campaign, at Wapping Youth Centre in Wapping, east London, Monday September 12, 2005. Brooke, who plays homeless character Kelly Taylor in Eastenders, is supporting the project that is aimed at ensuring young people get the right help when facing a housing problem such as becoming homeless or tackling bad landlords. PRESS ASSOCIATION Photo. Photo credit should read: Johnny Green/PA (Photo by Johnny Green - PA Images/PA Images via Getty Images)
LONDON, ENGLAND - JUNE 11: Sisters of murdered schoolboy Ben Kinsella, Brooke and Jade stand outside the Old Bailey on June 11, 2009 in London. Three men have been found guilty of murdering teenager Ben Kinsella in north London in June 2008. 16 year Ben, the brother of EastEnders actress Brooke Kinsella, was stabbed 11 times near a bar in Islington. (Photo by Peter Macdiarmid/Getty Images)
British opposition Conservative party Leader David Cameron (L) listens as former eastenders actress turned anti-knife campaigner Brooke Kinsella speaks during election campaign event in Lambeth, south London on April 27, 2010. AFP PHOTO/Leon Neal (Photo credit should read LEON NEAL/AFP via Getty Images)
Brooke Kinsella sister of murdered teenager Ben Kinsella chats with Home Secretary Theresa May in London today about her report into knife crime and how the government is to give 18 million towards fighting knife, gun and gang crime. (Photo by Stefan Rousseau/PA Images via Getty Images)
British actress Brooke Kinsella proudly holds her MBE, after it was presented to her by the Prince of Wales during the Investiture Ceremony at Buckingham Palace in central London on December 14, 2011. AFP PHOTO/POOL/ John Stillwell (Photo credit should read JOHN STILLWELL/AFP/GettyImages)
LONDON, ENGLAND - JULY 06: (EMBARGOED FOR PUBLICATION IN UK TABLOID NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME. MANDATORY CREDIT PHOTO BY DAVE M. BENETT/GETTY IMAGES REQUIRED) Brooke Kinsella speaks on stage at vInspired Live, a youth social change event, at The Roundhouse on July 6, 2013 in London, England. (Photo by Dave M. Benett/Getty Images for vInspired Live)
LONDON, UNITED KINGDOM - JULY 17: Shobna Gulati and Brooke Kinsella attending the ITV Summer Reception on July 17, 2013 in London, England. (Photo by Mark Robert Milan/FilmMagic)