Felicite Tomlinson and Louis Tomlinson

Felicite Tomlinson, the 18-year-old sister of One Direction member Louis Tomlinson, has died after suffering a heart attack, according to TMZ.

(Meredith) -- Felicite Tomlinson, the 18-year-old sister of One Direction member Louis Tomlinson, has died after suffering a heart attack, according to TMZ.

Felicite died Wednesday at her apartment in London. TMZ reports she collapsed from a heart attack and someone else in the apartment called for an ambulance, but she was pronounced dead at the scene when paramedics arrived.

Felicite was a fashion designer, model and Instagram influencer with more than 1.3 million followers.

Felicite and Louis Tomlinson

Felicite Tomlinson (pictured second from left) shared this photo on Instagram Dec. 30, 2018, with the caption "Family" and a heart emoji. Her brother, One Direction member Louis Tomlinson, is pictured on the left.

The loss of Louis' sister comes just over two years after the siblings lost their mother to a long battle with leukemia. Last week, Louis released an emotional new song about his mom's death, titled "Two of Us."

Louis and Felicite have five other siblings.

This is a developing story.

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