Credit: ABC (2)

Bristol's ready to bust some moves!

Prepping for her Dancing with the Stars debut, Bristol Palin hit the dance studio for the first time with her pro partner Mark Ballas.

Also spotted in the studio for the first time: Hills alum Audrina Patridge with partner Tony Dovolani.

"I just wanted to do it because it's so fun," single mother Palin, 19, told of her decision to participate in the show's eleventh season.

"It's positive and it's a good competition. I wanted to step outside my comfort zone and have a good time."

Her biggest fear, she admitted, will be "showing my personality and moving my hips!"

The mother to Tripp, 19 months, said her costumes will "be the most conservative...that's how I want to dress. But it'll be good, all the rhinestones and spray tans, that will be fun."