UPDATE Donny now denies he’s doing the show. But how can he explain what he already said? (You can see that video after the jump.)

Despite the unexpected events during the actual season, DWTS has actually become quite predictable.

Over the previous seven installments, we’ve seen the producers test several different types of rivalries. (And I don’t just mean amongst the professionals.) So far, we’ve had the married couple (Harry Hamlin competed one season after Lisa Rinna) and the former coworkers (90210‘s Ian Ziering/Jennie Garth and ‘NSYNC’s Joey Fatone/Lance Bass). Now the show is going for the siblings.

Earlier today, Donny Osmond (accidentally?) revealed that he is set to compete on Dancing with the Stars 8. On Tuesday’s episode of The Bonnie Hunt Show, the 51-year-old admitted “let the cat out of the bag” when pressed about a possible appearance. Donny’s participation will come three seasons after his sister, Marie, placed 3rd on the reality show. It’s not known at this time who the “Puppy Love” singer will be paired up with.

In other Dancing news, a casting rumor about Kevin Federline has just been shot down. Although Star magazine claimed Britney’s ex had been in talks with producers, his reps tell Hollyscoop that the report isn’t true. (That said, they would love to talk to someone now about getting him on the show.)

Dancing with the Stars returns Monday, March 9th @ 8:00.