On Monday night's "Dancing with the Stars" competition show, Donny Osmond and his partner Kym Johnson will be dancing the quickstep. Then they will be doing a team tango with Kelly Osbourne and partner Louis Van Amstel and Derek Hough and Joanna Krupa. So how steamy will this week's tango get?

"I guess I am going to announce I am going to be shirtless," Donny tells ET. "I have to keep up with Derek and Louis. Plus, we are taking our jackets off. I am out there pumping iron because I have to look good next to these guys."

Donny tells ET that despite his hectic schedule, which includes his Las Vegas show with sister Marie, he told Kym from the get-go that he wanted to be a part of the process, not a part of the scenery.

"When Kym and I first met and we started strategizing how to do this, I told her I didn't want her dancing around me. 'You make me dance with you,'" he recalls saying.

Donny also says that his biggest challenge right now isn't physical, despite the aches and pains. It is mental because there are so many dance moves that Kym is teaching him and, with another double elimination this week, it won't be long until the remaining contestants have to learn two full dances each week.

"Derek turned to me and said, 'The face of this show is about to change. In a couple of weeks, it will be down to a few couples.' I want to be in the semi-finals. Please, keep voting for me. I want to win that mirror ball," Donny says.

"Dancing with the Stars" airs Monday and Tuesday nights on ABC.