Louis Tomlinson's sister has died from a suspected heart attack.

18-year-old Félicité Tomlinson reportedly passed away while in her apartment in London on Wednesday. It is believed she collapsed from a heart attack. A person in the apartment called for an ambulance, but paramedics pronounced her dead at the scene after failing to revive her.

Félicité was an aspiring fashion designer, and had planned to release her clothing brand 'Fizzy' in the future. She was also planning to publish a book of her own poetry. The designer and writer was quite popular online, with more than one million followers on Instagram.

She was the sister of One Direction singer Louis Tomlinson, the oldest of seven siblings.

Félicité's death comes just under two and a half years after her and Louis' mother Johannah's death. Johannah Deakin died in December 2016 after a long battle with leukaemia, aged 43.

Louis is believed to be devastated with his sister's passing. He was due to perform for Comic Relief for the BBC, but has since pulled out to be with his family.

Fans have been sharing immense support online for Louis Tomlinson and his family at this difficult time.

Via TMZ.