Karina Smirnoff will be the first professional dancer on ABC's hit show 'Dancing With the Stars' to pose nude for Playboy -- in the midst of a season no less -- but don't expect any of her male competitors to go full monty anytime soon.

"The show has a very odd relationship with Playboy," a 'Dancing' insider tells me. "It's not something they like to admit or comment on, but sexy girls have long provided the show with a huge male demographic, helping to make it one of the most watched shows on TV."