Who knew that Katie Holmes was such a dancing queen? While paying a visit to 'Late Night with Jimmy Fallon' (weeknights, 12.35AM ET on NBC), the woman also known as Mrs. Cruise revealed that not only will she be guest-judging the 'So You Think You Can Dance' finale on Wednesday night, she's also quite the mover herself.

"I do dance in my car," the actress admitted. "I've gotten caught before, but that doesn't stop me. I think, you know what, I like to do it, and when I see other people doing it, I'm like, 'that's right, enjoy it!'"

"That doesn't make it right, 'cause you like it!" Fallon laughed. "I like to text in the car too, but I have to drive -- and I like drinking, okay, so what?"

Fallon wasn't convinced that dancing behind the wheel wasn't dangerous, so he dropped a beat to allow Holmes to demonstrate -- I think she proved our host's point even better than he could ...