09/08/2011 at 10:00 AM EDT
Also in Las Vegas: Audrina Patridge
, who enjoyed dinner at the Hard Rock Hotel & Casino's newly-opened restaurant 35 Steaks + Martinis with her brother Mark and on-again beau Corey Bohan
. The group headed to Vanity Nightclub next, and the Hills
star spent her night dancing with her friends and mingling with excited fans.