George Lopez was livin’ large in Las Vegas last week when he hit town for a Justin Timberlake charity golf tournament. The comic was seen at Old Homestead Steakhouse at Caesars Palace, where we’re told he “spared no expense” wining and dining pals. A spy says Lopez “dropped a ton on multiple bottles of Dom Pérignon” at $800 a pop. And he was seen “slipping the hostess a crisp $100 on his way out,” the spy said. Timberlake was also spotted at the restaurant after the golf tourney wrapped.