02/20/2009 at 06:00 AM EST
, causing chaos as female fans furiously snapped pictures of the heiress while she applied makeup in the ladies' room at Indochine in New York. There to celebrate the Vladimir Restoin-Roitfeld Collective Hardware photography exhibition, Hilton was joined by guests like a baseball cap-sporting Leonardo DiCaprio
and Claire Danes
at the super-packed soiree. The makeshift dancefloor was so crowded, in fact, revelers tipped over the 10 ft.-tall plants!