The make-up artist partied with her Made In Chelsea boyfriend Sam Prince at the festival – taking her mind off the terrible tragedy.
Lottie, whose half sister Felicite was found dead in a flat in Earls Court, London, in March, let her hair down and watched headliner Ariana Grande, and attended the Revolve party.
The festival marks Lottie’s slow return to public life since the sudden death of her half-sister.
Felicite was found dead last month – leaving friends and family shocked.
Big sister Lottie posted: “My Fizzy, my baby sister, my best friend. I’m incomplete without you, I’m empty. I can’t picture my life without you.
“I wish we could have lived life together for a little longer. Mama needed you and you needed her, you’re finally together again.
“I love you always, Dotty x”.
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Félicité’s death came two years after the family were left reeling by the death of their mother Johannah Deakin.
Johannah, who had 1D star Louis, 25, Lottie, Félicité, 14-year-old twins Phoebe and Daisy and five-year-old twins Doris and Ernest – lost her battle with leukaemia aged 43 in December 2016.
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by – TheSun TV and Showbiz