An onlooker said: "Beyoncé is usually ultra composed, but at the party she was having a really fun time. She joined in the champagne toast. It was strange to see her make such a shaky exit."
Jay-Z - who wowed his fans at the Royal Albert Hall concert - was left unfazed by his fiancée's ungraceful departure and joked: "Beyoncé was like a green whirl on the dancefloor."
Fellow revellers at the star-studded bash Gwyneth Paltrow, her husband, Coldplay frontman Chris Martin, and The Pussycat Dolls.

Speaking of Gwyneth, Palthrow has struck up a close friendship with Beyoncé Knowles, after she and husband Chris Martin joined the R&B star's boyfriend Jay-Z on stage for a performance.

The Shakespear in Love actress and Knowles' partners are work colleagues and friends and introduced the two women reports IOL

Last week, the pair spent hours shopping in Knightsbridge, London together, before a night of dining at Japanese eaterie Zuma and dancing at nightclub Movida