07/19/2011 at 10:20 AM EDT
Also catching the Beacher's Madhouse festivities: Paris Hilton
, sans new beau Todd Phillips
, who hung out with sister Nicky
and pal Brandon Davis
. Paris danced a bit, but was also focused on her BlackBerry, while her sister was more social. At one point, Nicky went over to talk to DiCaprio and Cooper.