Hollywood star Bradley Cooper and his British model girlfriend Suki Waterhouse were among the guests.
The model stunned in a dusty pastel dress which featured a plunging neckline and flowing skirt, pairing it with a pair of vertiginous floral Topshop heels.
Cooper looked dapper but laidback in a navy suit, blue shirt and Ray-Ban Aviator sunglasses.
Keira Knightley also impressed in a colourful Chanel dress as she posed with her husband, Klaxons singer James Righton. The frock featured one shoulder, a dotted embellished bodice, a voluminous floral appliqué skirt with a pleated silk underlay.
Lily Allen set off her purple and orange ombre hairstyle with a black shirt mini-dress with three-quarter length sleeves, which had a daring tasselled back. She paired the dress with navy sequin Christian Louboutin court heels.
Gemma Arterton went for an unusual red silk two piece ensemble, which paired an asymmetrical high waisted skirt with a midriff-baring top. Strappy ribboned heels finished off the look.
Cara Delevingne went for an atypically restrained look in a black floor length gown. She kept the effect simple and chic with a high ponytail and subtle makeup.
Alexa Chung was similarly demure in a strapless black dress which was lifted with cut-out hemline detailing.
Supermodel Naomi Campbell turned heads in a red sequin cocktail dress.