Only ET is inside Donny Osmond's rehearsal as he prepares for his "Dancing with the Stars" debut with partner Kym Johnson.

"I started this whole thing in pretty good shape. The show in Vegas has kept me in good shape," says Donny, who does admit to being very sore, though, and finding out he has muscles in places he didn't know about. "All the [Vegas show] dancers are laughing at me because they know what I am going through."

So does that mean Donny will be doing a Gilles Marini and ripping off his shirt?

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This image from video provided by U.S. Immigration and Customs Enforcement via DVIDS shows manufacturing plant employees waiting to have their legs shackled at the Hyundai Motor Group’s electric vehicle plant, Thursday, Sept. 4, 2025, in Ellabell, Ga. (Corey Bullard/U.S. Immigration and Customs Enforcement via AP)

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