One Direction star Louis Tomlinson's sister Felicite has died after suffering a suspected cardiac arrest aged 18.
The aspiring fashion designer died at her flat in Earl's Court, west London, on Wednesday.
Her death is being treated as unexplained by police.
In a statement, Scotland Yard said: "Police were called by London Ambulance Service at 12.52 on Wednesday, March 13 to a residential address... following reports of a female in cardiac arrest.
"A female believed to be aged 18 was pronounced dead at the scene.
"A post-mortem examination will take place in due course."
A person who was with her called 999, according to the Sun.
Louis has been left 'devastated and distraught' by the death, the Sun reported, and praised his sister as 'loveable, caring, bright and beautiful' last night.
Louis Tomlinson's sister Felicite dies
Louis Tomlinson's sister Felicite dies
Her reported passing comes just a few years after the death of their mother.
Louis Tomlinson's sister Félicité, 18, found dead at London home after 'suspected heart attack'
One Direction Star Louis Tomlinson's Sister Félicité Dead at 18
The 18-year-old, known as Fizzy, was an aspiring Fashion designer. Source: Instagram
One Direction star Louis Tomlinson's sister Félicité, 18, 'found dead at home'
Félicité Tomlinson, younger sister of former One Direction member Louis Tomlinson, died Wednesday at age 18.
2017 Teen Choice Awards – Show – Los Angeles, California, U.S., 13/08/2017 - Louis Tomlinson and Bebe Rexha perform "Back to You." REUTERS/Mike Blake
Britain Football Soccer - England XI v Rest of the World XI - Soccer Aid 2016 - Old Trafford - 5/6/16
England XI's Louis Tomlinson and Rest of the World XI's Niall Horan
Reuters / Phil Noble
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One Direction members British singers and songwriters Louis Tomlinson (R) and Liam Payne receive their British Video award at the BRIT Awards at the O2 arena in London, Britain, February 24, 2016. REUTERS/Stefan Wermuth EDITORIAL USE ONLY
British singers and songwriters Louis Tomlinson (L) and Liam Payne arrive at the BRIT Awards at the O2 arena in London, February 24, 2016. REUTERS/Paul Hackett
Members of boy band One Direction, Niall Horan (L-R), Liam Payne, Louis Tomlinson, Zayn Malik and Harry Styles, attend the Royal Variety Performance in support of the Entertainment Artistes' Benevolent Fund, at the Palladium Theatre in London November 13, 2014. REUTERS/Yui Mok/Pool (BRITAIN - Tags: ENTERTAINMENT SOCIETY)
British boy band One Direction arrives at the Cannes festival palace to attend the NRJ Music Awards in Cannes December 14, 2013. Pictured are (L-R): Louis Tomlinson, Niall Horan, Liam Payne, Zayn Malik, Harry Styles. REUTERS/Eric Gaillard (FRANCE - Tags: ENTERTAINMENT)
(From L to R) Louis Tomlinson, Niall Horan, Liam Payne and Harry Styles of British boy band One Direction arrive for the premiere of their documentary film "This is Us" in New York, August 26, 2013. REUTERS/Lucas Jackson (UNITED STATES - Tags: ENTERTAINMENT)
Members of the music group One Direction (L-R) Louis Tomlinson, Niall Horan, Zayne Malik, Liam Payne, Harry Styles, and Director Morgan Spurlock, pose for photographers during a photocall for their film 'One Direction; This is Us' in London August 19 2013. REUTERS/Suzanne Plunkett (BRITAIN - Tags: ENTERTAINMENT SOCIETY)
Performer Louis Tomlinson from One Direction sits with his friend in the front row at the Unique for Topshop Autumn/Winter 2013 collection during London Fashion Week, February 17, 2013. REUTERS/Olivia Harris (BRITAIN - Tags: FASHION ENTERTAINMENT)
Members of British-Irish boy band One Direction (L-R) Zayn Malik, Niall Horan, Harry Styles, Louis Tomlinson and Liam Payne arrive for the premiere of "Men In Black 3" in New York May 23, 2012. REUTERS/Andrew Kelly (UNITED STATES - Tags: ENTERTAINMENT)
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The singer has pulled out of Friday night's Comic Relief, where he was due to perform his new single live as one of the headline acts.
Tomlinson's mother Johannah died from leukaemia in 2016.