One Direction’s Louis Tomlinson's sister, Félicité Tomlinson, dead at 18

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The model and social media star, 18, collapsed Wednesday at her London apartment from a suspected heart attack, according to news reports.

The Metropolitan Police Service told E! News that when emergency responders arrived, they found a female in cardiac arrest who was pronounced dead at the scene.

"Police are in the process of informing her next of kin," E! reported, according to a police statement. "At this stage the death is being treated as unexplained. A post-mortem examination will take place in due course."

The loss of Félicité Tomlinson comes just two years after the family lost their mother, who died from leukemia.

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Louis Tomlinson, 27, just released an emotional tribute song to his mother called “Two of Us,” who died in 2016.

The last post Félicité Tomlinson shared on Instragram is a selfie of her sitting on the floor with the caption, “Don’t know why I look so shocked,” with a heart emoji.

View this post on Instagram

Don’t know why I look so shocked 🖤

A post shared by Félicité Tomlinson (@felicitegrace) on

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