Social media-loving celebrities flooded Twitter and Instagram with some of the best photos from the glam fashion event.
And behind their polished exteriors and expensive designer outfits, they proved that when it comes to having fun on a night out, they're no different to anyone else.
In this HELLO! Online special report we go behind the scenes at the Metropolitan Ball, which turned out to be one of the most star-studded to date.
Lily Allen posted this pic of Cara Delevingne goofing around