Félicité Tomlinson, the 18-year-old sister of One Direction member Louis Tomlinson, has died, reports TMZ.
The teen suffered a possible heart attack at her studio apartment in London. Someone called emergency services, but paramedics were unable to revive her.
A source tells TMZ that Félicité did not have a known heart problem, and that there were no warning signs.
She was an influencer with a huge Instagram following of more than a million.
Louis reportedly canceled an appearance at a Comic Relief charity event, set to air on Friday.
Louis and Félicité’s mother, Johannah Poulston, died in December 2016 at age 43 after a battle with leukemia.