We've had a lesson in how to dress for a summer soiree thanks to Holly Valance and Mischa Barton.
Holly Valance embraced the metallic trend in a gold sequinned dress embellished with silver stars.
The 29-year-old Australian star kept her accessories simple, wearing a thin black belt, nude peep-toe heels and a gold sequin clutch.
She was joined by fiancé Nick Candy who was dapper as ever in a suit with his shirt open at the neck.
Mischa Barton went floaty but looked just as gorgeous in her floor-length gown.
We're taking style notes for the next time we need to look demure.
Mischa Barton wore her hair in a loose up do and brought a pop of colour with her red lipstick.
She wrote on Twitter ahead of the party: "On my way to #serpentine with @Rachelbakewell ! So excited...I love being in the park and particularly visit the serpentine frequently."
Nancy Dell'Olio was the other guest who really caught our eye.
She channelled Cleopatra in a silver head piece and full-on make-up.
Holly Valance's Strictly Come Dancing co-contestant Nancy wore a white halterneck frock and loved posing for the photographers.
Good for you Nancy, we'll take a note of your outfit for our next fancy dress party. Love. It.