Félicité Tomlinson, the sister of One Direction star Louis Tomlinson, has been found dead in her London home at the age of 18 after a suspected cardiac arrest.

An Instagram star and fashion designer with almost 1.3m online followers, last year Félicité said that she planned to release her own clothing line under her nickname 'Fizzy', The Sun newspaper in the UK has reported. She was also planning to publish a book of her poetry.

According to The Sun, Louis has been left "devastated and -distraught" by the death of his sister, who has been praised as "loveable, caring, bright and beautiful" by "sources close to the One Direction singer".

The newspaper reports that Félicité collapsed after a suspected heart attack at her apartment in Earls Court, West London, on Wednesday lunchtime.

A full post-mortem examination will take place and toxicology tests will be carried out.

Louis, 27, who was said to be very close to his younger sister, was informed of the death on Wednesday night.

He has since pulled out of his performance on Comic Relief this Friday.

Stars including James Corden, Olly Murs and Charlie Puth have reached out to Tomlinson and offered their support on social media.

Last night a family source said: "Félicité was an absolutely adored young woman who was loved by Louis and her whole family. They are all totally devastated, as you can imagine.

"She had so many friends and was such a positive happy person. It’s a massive loss to the world. She was a loveable, caring, bright, passionate, popular and beautiful young lady."

The siblings’ mother Johannah died from leukaemia in 2016.