Learn the Cha-Cha with Mario and Karina!

Mario Lopez and Karina Smirnoff are getting in the dancing spirit for tonight's season premiere of "Dancing with the Stars"!

This week, Karina and Mario will show you how to do the Cha Cha. Check back every week for a new dance, and be sure to watch "Dancing with the Stars'" 3-night premiere event, starting tonight on ABC.