Being Hugh Hefner's girlfriend is a job fit for three woman. Don't believe us? Then you haven't watched the E! reality series "The Girls Next Door." Our all-time favorites of Hef's gal pals are Holly Madison, Bridget Marquardt and Kendra Wilkinson, who appeared on the show's first five seasons. Although they've all moved on from Hef and out of the mansion, we bet they were three times the fun.