Hugh Hefner is a silver-tongued ladies’ man, but the world’s most famous playboy couldn’t convince Mary-Kate and Ashley Olsen to pose for his magazine.

After striking out when the twins turned 18, Hugh tried again, hoping they would pose for Playboy’s June issue to mark their 22nd birthday.

“Hef thinks the twins are every young man’s fantasy,” an insider tells Star.

Unfortunately, it’s not their dream. “They’re all about high-end fashion these days,” says the insider. “They want to do Vogue.” Besides, the twins aren’t getting along right now, adds the source. “Ashley is jealous because Mary-Kate is getting all the acting roles.