Paris Hilton and Sam Worthington Spotted at Las Vegas Nightclub

During Memorial Day weekend, Heiress Paris Hilton partied up at Grand Opening of Encore Beach Club and Surrender Nightclub in Las Vegas, Nevada.

Paris rocked the event as she joined on stage Kaskade Sundays and started dancing and singing along with the group's song "I'm in Miami B**ch".

Obviously enjoying the performance was "Avatar" star Sam Worthington.

The actor arrived at the venue with an eco-friendly bag.  Sam watched the party scene from a second story cabana while partying with a large group.

Aside from Paris and Sam were "Dancing with the Stars" contestant Stacy Keibler and New Orleans Saints running back Reggie Bush.

Stacy and Reggie went back to the venue for a second day with close friends and his sister.