An ambulance was called to her home in Earls Court, London after she collapsed, and paramedics pronounced the 18 year old dead at the scene after attempting to revive her.
Felicite Tomlinson attends "The Spongebob Movie: Sponge Out of Water" screening on March 15, 2015 in London, England.
I have £70,000 in savings. How can I retire in 15 years with an income of £25,000 a year?’ Money
And as the family grieves during this heartbreaking time, celebrities and close friends of Louis are reaching out to be there for the star. I can't imagine how hard it is right now.
Watford boyband Rak-Su, who won the fourteenth series of the X Factor before Tomlinson debuted as a judge, sent their sympathies. "That has kept me driven, that's kept me determined and that's helped with going through all that stuff I think is being there for my family".
Felicite Tomlinson has tragically died aged 18.More news: Two more top Facebook executives leave the company
Scotland Yard said police were called by London Ambulance Service at 12:52 on Wednesday to a residential address following reports of a woman having a cardiac arrest.
It added: "A post-mortem examination will take place in due course". A person who was with her at the time called 999 (the United Kingdom version of 911), and emergency responders quickly arrived on the scene.
Felicite was well-known on social media, with 1.3 million followers on Instagram.More news: Callum Hudson-Odoi reveals Chelsea FC’s best player in training
On January 30, she posted a picture of a row of tattoos on her forearm, which she said were the initials of all her siblings.
Louis has cancelled his appearance on tonight's Comic Relief following the tragedy.More news: Senate approves ending USA role in Yemen as Trump threatens veto