Now that Britney Spears is a single woman again, she already has at least one potential beau: Hugh Hefner. The 77-year-old Playboy founder said he's interested in adding the pop singer to his bevy of beautiful blonde girlfriends. "Britney would make a great girlfriend," Hefner told Us Weekly magazine for its Jan. 19 issue. "Picasso had his pink period and his blue period. I am in my blonde period right now," he said. "I think it's related to those early movies that had such a great influence on me when I was a kid." Hefner said he'd also like to...