There are only two more weeks of competition. Donny Osmond and partner Kym Johnson have made it into the semi-finals -- but for this coming week's competition, they have to perform three dances! Can they do it?

"We had always hoped to get this far," Donny tells ET. But he knows it is a tough week. There are four couples and only three slots in the finals -- and, of course, he wants to make it that far.

"Marie will rub it in my face forever [if I don't make it as far as she did]," he says. "My main motivation right now is to at least tie Marie. If and when we get into the finals, it is the trophy all the way."

On Monday, Donny and Kym will be dancing the samba, tango and jitterbug.

"Of all these three dances, the one that scares me the most is all three of them," Donny says, laughing. "Because they all three have to be perfect. They have to be the best we can do. It is down to the wire. There is no fooling around. There is no room for mistakes."

One fun thing about the samba for Donny is he and Kym will be dancing to his first No. 1 record: "One Bad Apple."

"It was difficult choreographing the routine because it is Donny's song, so I felt a lot of pressure to make it really good and showcase Donny," Kym tells ET. "He has a solo in it. All the celebrities have to do a 15-second solo in the semi-finals."

"Dancing with the Stars" airs Mondays and Tuesdays on ABC.