Amid the UK heatwave, celebrities braved the scorching evening in London for an invitation-only ticket at the Serpentine Gallery summer party. Actress Salma Hayek led the stars as she co-hosted the party and they all gathered together for the annual fundraising event and the guestlist included everyone from Sienna Miller through to Rebel Wilson.
© Alan Chapman/Dave Benett/Getty IThe actress looked chic
Rebel Wilson
Pitch Perfect star Rebel was a lady-like vision in a Louis Vuitton shirt dress in a monochrome print, paired with LV accessories of a baby pink bag and golden heels. She attended with her wife, Ramona Agruma.
© Alan Chapman/Dave Benett/Getty IThe star had her legendary locks looking perfect
Isla Fisher
Isla Fisher's fiery mermaid waves stole the show (as usual) but coming a close second was her figure-hugging pastel pink dress by Rebecca Vallance. The column design was incredibly simple with a few strategically placed floral vibes on the corset. The ultimate feminine look.
© Alan Chapman/Dave Benett/Getty IMaya took a walk on the wild side with her look
Maya Jama
Love Island presenter Maya Jama took time out of her busy schedule to attend the evening, and she did so in a statement bandeau dress which was a unreleased David Koma RE27 number with a bold snake print all over.
© WireImageRosie's thigh-high split stole the show
Rosie Huntington-Whiteley
Rosie Huntington-Whiteley was top of her game, working the cameras in a show-stopping angelic white dress with a thigh-high split. Finishing the look with a gold necklace and a pair of chic black heels.
© Alan Chapman/Dave Benett/Getty ISienna wrapped up despite the heatwave
Sienna Miller
Sienna Miller, who gave birth just last month, wowed in an Olivia von Halle silky midi dress in a champagne hue with a plunging neckline. Bizarrely, the star wore a fur jacket draped over her shoulders, despite the record-breaking temperatures in the city.
© Mike Marsland/WireImageThe singer went for all black
Ellie Goulding
Black may not be the go-to colour for summer outfits, but Ellie Goulding still looked cool and breezy in her chic trouser and top combo. The off-the-shoulder corset top featured feathers and glitter and she teamed it with sheer trousers.
© Mike Marsland/WireImageThe singer looked wore a floaty number on the night
Pixie Lott
Ruffles, embroidery and embellishments - Pixie Lott's mint-hued gown had it all. The star wore her signature blonde locks in a half-up half-down style, complementing the girlie dress.
© Mike Marsland/WireImagePastels were popular on the night
Salma Hayek
Co-host Salma Hayek donned a unique dress for her red-carpet appearance. The purple dress with a giant shoulder bow also featured silk panels, making for an eye-catching design.
© Alan Chapman/Dave Benett/Getty ICheck out the shoes!
Pixie Geldof
Model and singer Pixie Geldof was among the celebrity crowd at the event and she went for a heatwave-approved knee-length, spaghetti-strapped dress. Interestingly, she teamed the salmon coloured design with eye-popping green heels and a brown bag.
© Alan Chapman/Dave Benett/Getty IWow-factor sleeves at the ready
Celia Imrie
Olivier-award winning actress, Celia Imrie, who is also well known for THAT moment in Celebrity Traitors, swoops my rosette for best dressed. The 73-year-old went for old Hollywood glamour with a cream and silver dress featuring extra large feathered sleeves. It's totally a dancefloor dress!
© GettyLast year's stand outs from the Serpentine summer party
Last year's fashion highlights
The 2025 party was a sartorial success with the Spencer sisters stealing the show. Twins Lady Amelia and Lady Eliza Spencer matched in red Grecian gowns and Lady Kitty Spencer channelled Cinderella in a blue fairytale number. Lily Allen went for a monochrome dress featuring polka dots and feathers - proving all levels of fabulousness!
Fancy a throwback? See 2024's best dressed list.

Amy Jackson proving tailoring is always a winner
Amy Jackson
Actress Amy Jackson wore a suit from the Rebecca Vallance Resort 2026 collection, giving us an exclusive real-life look at a piece that doesn't launch until October. Divine!

Isha Ambani wowed in red
Isha Ambani
Chair of the host committee, Isha Ambani, was also in attendance and she was a stunning lady in red wearing a statement look by Steve O Smith.




