DONNY OSMOND is putting himself through hell in the run-up to his stint on DANCING WITH THE STARS - he is rehearsing his moves on a fractured bone.

The Puppy Love crooner is following in the footsteps of his sister Marie by appearing on the hit U.S. celebrity talent contest’s forthcoming season.

But the rehearsal period has not been easy - the singer is pushing himself to the limits to ensure he is ready to cause a stir on the dancefloor.

He tells Britain’s Daily Express newspaper, “I’m dancing on kind of a fractured bone. I was doing some knee turns and hurt my right knee. All my body is in pain. Like last night I did a show in Vegas. After six hours of rehearsals I could barely get through the show.”

And the star admits it’s been hard taking advice from his sister, who was on the show in 2007.

He jokes, “Marie will be my toughest critic because she said, ‘I’ve been there, you’ve got to do this, you’ve got to do that.’ I said, ‘Marie will you just shut up? Shut up.’”