New Year's Eve may mean expensive drinks and ticket prices, but for for celebrities performing tonight at various big-city bashes, it’s a chance to make some serious money. Lady Gaga will be performing poolside at Miami’s Fontainebleau Hotel (tickets are reportedly selling for $425 to $25,000), while up the coast, Gaga’s one-time costar, Gossip Girl’s Leighton Meester will perform at Atlantic City’s Caesar’s Palace. Over in Sin City, Nicole Richie will host while her boyfriend Joel Madden spins at Lavo; Christina Aguilera will be at Tao, and Eva Longoria Parker will host a party at her new spot Beso. The Black Eyed Peas, according to TMZ, are earning a whopping $700,000 to perform at nightclub LAX, while 50 Cent will earn $100,000 to show up at Pure. In Los Angeles, Adam Lambert will perform at the Paramount Pictures Studio Backlot on the Times Square Stage. At the real Times Square, meanwhile, Ryan Seacrest has reportedly convinced Jennifer Lopez to perform during ABC’s New Year's Rockin' Eve.