Louis Tomlinson has been seen for the first time since his younger sister Félicité Tomlinson died at the age of 18 .
The social media influencer was found dead in her London flat on March 13 after suffering a suspected heart attack.
And while her other siblings, including Daisy and Lottie, have been sharing tributes to Félicité on social media, One Direction singer Louis has kept his head down as the family deals with their horrific grief.
But he spent the day with sister Daisy, who celebrated her 16th birthday along with twin sister Phoebe.
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The siblings hit up a go-karting track for the day, dressed in identical jumpsuits and helmets as they raced each other around the course.
Daisy shared snaps of their day out with her followers, admitting she knew her big day would be hard to get through without older sister Félicité.
"I always knew today was going to be difficult but my fam have made it so much fun. Birthday go-karting... I did come last place though," she captioned one snap.
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Of another, which showed Louis throwing up a peace sign as he posed in his helmet, Daisy wrote: "Brother, best friend."
The X Factor judge and his family were said to be 'devastated' by the tragedy, which just comes two years after the death of Louis ' beloved mother Johannah Deakin.
Sources close to Louis described Félicité, who was known as 'Fizzy' to friends, as "a loveable, caring, bright, passionate, popular and beautiful young lady."
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Their mum, midwife Johanna, had seven children altogether: Louis, Charlotte (or Lottie), Félicité, and two sets of twins, Phoebe and Daisy and Ernest and Doris.
Johanna split from Louis' father Troy Austin when her boy was just a toddler.
Louis, who is now estranged from his real dad, went on to take on the name of his mum's second husband Mark Tomlinson - with whom Johannah went on to have four more children.
