Hugh Hefner’s live-in girlfriends, reality stars of The Girls Next Door, Kendra Wilkinson, Holly Madison, Bridget Marquardt are posing for Guitar World magazine’s 2009 buying guide The girls all pose together for one cover shot and each one of them apparently has her own separate cover photo. So that makes 4 covers! We all know Hefner’s favorite girlfriend is Holly, who’s yours?

more photos after the jump…