CLUB PHOTOS: Joe Jonas, The Situation, Pauly D, Carmen Electra, Brandi

Joe Jonas partied at Liquid Pool Lounge during the daytime Saturday with friends in a cabana, then he and friends went to Yellowtail Japanese restaurant, played blackjack, and clubbed at Haze, where he performed new solo songs. (Courtesy photos by Denise Truscello/WireImage.)

The Situation's family tossed a 24th birthday party for sister Melissa Sorrentino, and it featured Nick Cannon. The Situation ate at Sugar Factory with friends and family. Also eating there this weekend: David Arquette; and Lucas Till. Sitch and Ryan Cabrera were at Gallery Friday. Sitch partied at the Pussycat Dolls Burlesque Saloon. He just really signed up to promote everything in that sphere. (Courtesy photos by David Becker/WireImage.)

Pauly D DJ’d for the mass of costumed women and men at the lingerie masquerade “Midsummer Night’s Dream” Saturday at the Palms pool. By the way, he ate with friends Friday at Pink Taco and Hard Rock Hotel. (Courtesy photos by Denise Truscello.)

Carmen Electra partied at Azure Luxury Pool Saturday. Also there: Ryan Cabrera. (Courtesy photo by IMagesOfVegas.com/ISPhotography.)

Nick Cannon DJ'd at Gallery. "X-Men's" Lucas Till partied at Gallery and Chateau. (Courtesy photos by David Becker/WireImage.)

Brandi Glanville partied at Tao Beach on Saturday with girlfriends. Maxwell arrived later topless. Glanville ate at Tao Asian Bistro with friends. (Courtesy photos by Al Powers.)

UFC's Frank Mir went on stage at "Jabbawockeez" show at Monte Carlo Saturday. (Courtesy photos.)

Omarion performed at LAX after eating at Social House. (Courtesy photo by Scott Berry.)

Maxwell and chef Thomas Keller helped Tao Group partner Noah Tepperberg celebrate a birthday. Dining at Lavo: Brandi Glanville. Joe Jackson was at the club. (Courtesy photos by Al Powers.)