"If you're not partying your [expletive] is fired!" warned Donald Trump Saturday night, and his The Celebrity Apprentice cast took him at his word! Breaking Celebrity News has all the wildest pictures of the wild bunch as they took on Sin City.

The big event went down at the hip Surrender Nightclub at Encore Las Vegas.

That's where we found Gary Busey pole dancing -- and he was sober! -- Lil Jon spinning, and fellow competitors NeNe Leakes and Hope Dworaczyk dancing the night away.