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Donny Osmond, Marie Osmond

Denise Truscello/WireImage.com

Donny is going where another Osmond has gone before.

Apparently not afraid of a curse that his very own sister may have helped unleash, the family-friendly entertainer more or less revealed Monday that he'll be competing on the next season of Dancing With the Stars, which premieres in March.

"Well, I guess I am making an announcement," Osmond, with Marie by his side, said during a taping of The Bonnie Hunt Show. "I'll say I am seriously considering doing it, let's put it that way."

Meanwhile, a rep for ABC tells E! News, "We don't comment on casting rumors."

But the Osmonds sure had a lot to say about this particular "rumor."

The "considering" Donny was doing dissolved into good-natured sibling rivalry as the singer protested that he couldn't let Marie—"Who do you think taught her how to dance?"—upstage him, and then into full-blown planning for the challenge ahead.

"It is going to be very difficult because I am going to be doing Vegas on top of doing Dancing with the Stars," he said. (Donny and Marie have a standing variety-show engagement at the Flamingo Las Vegas.)

The unbridled enthusiasm offered up by Marie and Bonnie Hunt can be seen on Tuesday's show.

Actually, if he were to compete, Donny would do well to finish as strongly as Marie—she came in third on DWTS in a season largely remembered for a fainting spell, public revelations about a son in rehab and relentless doll promotion.

All of which involved Marie, by the way.