Olympian Shawn Johnson doesn't let her youth prevent her from achieving high marks on "Dancing with the Stars," but is the gymnast at a disadvantage by being just 17?

No twists or flips to this rumor -- it's true! Since Shawn is under 18, the law only allows her so much time for rehearsals each week. "I can only go six days a week and so we have to skip Wednesday every week." The tiny dancer adds, "Plus, on the other days, we can only do five hours."

Don't miss it when Shawn heats up the dance floor with professional partner Mark Ballas -- tonight on ABC!