Sean “Diddy” Combs is looking for his next big-screen role after playing maniacal music mogul Sergio Roma in the Jonah Hill comedy “Get Him to the Greek.” The hip-hop impresario was spotted by our spies having lunch at Soho House in Los Angeles last week with Todd Phillips, the director and producer of “The Hangover” franchise, sparking buzz that Diddy could show up in “The Hangover III.” Warner Bros. recently slated the latest “Hangover” chapter for release May 24, 2013. A rep for Combs — who has recently been romancing Cameron Diaz — said: “I can tell you Sean is in LA aggressively working on his film career and a follow up to ‘Greek.’ ” Phillips also recently produced “Project X.”