The Insider's Kevin Frazier catches up with Dancing with the Stars contestant Ricki Lake during a rehearsal with her pro partner Derek Hough. The duo debuts a theme song for their "Team DRickilous" and Ricki reveals how much weight she's dropping from her grueling rehearsals.

Ricki said she and Derek make a great pair because they take the dancing seriously, but not themselves, and she feels lucky to be "learning from the best." But she said the process has been physically draining. "I was prepared to work harder than ever. But it's even harder. I mean every part of my body -- my lower back particularly hurts right now -- but my hips, my knees, I'm 43. I've never danced like this, I've never worked out for this many hours at time, and I am shrinking."