Rockspawn KELLY OSBOURNE could be set to bare all for Payboy.

The singer has shed stones in training for Dancing With The Stars which se is currently starring in.

But it seems it's not just Kel's dance moves which are impressining people and now HUGH HEFNER's twin girlfriends KARISSA and CRYSTAL SHANNON are campaigning to get the star to strip.

Crystal says, "She's losing weight and she's blonde now. She looks good. I want to see what she looks like naked."

Karissa adds, "Yeah, we want to see Kelly Osbourne naked!"

And Hefner reveals that's not an impossibility, telling Eonline.com he has approached the pop star with an offer, adding, "Kelly would be happy to pose."

But she's not his girl of the moment - Hef wants sexy Transformers star Megan Fox to reveal all, stating, "Megan's a fox!"