But if her dancing doesn't catch your attention...
Expect her to be wearing some of Dancing's skimpiest costumes yet. "She's very sexy so I don't think she'll be shy to show the skin," Ballas told us at this weekend's Creative Arts Emmy Awards in L.A.
Ballas, however, has not been distracted—or tempted. "No, none of that," he smiled. "We're just friends."
Ballas says Cavallari has avoided injuries while rehearsing up to six hours a day perfecting their first dance, the cha-cha.
"I think she definitely has what it takes because she works hard," he says. "She tries hard and she's very focused and she's coordinated. I think she's going to do pretty well."