If Mike Greenberg is confirmed he might be an interesting celebrity. He is not handsome but kinda cute in his own way and quite witty. He could be fun especially if dances well enough to hang in there a few weeks. Not a big guy so I could see him with Chelsie. He is a sports reporter and wrote a book entitled "Why My Wife Thinks I'm an Idiot."

So far they have annouced this celbreties taking part( this is from ABC board)
So far, here are the first 8 stars announced:
Tom Bergeron announced the following contestants/stars this morning, August 17th.

1st - Sports Illustrated model - Kathy Ireland
2nd - Grammy winning singer - Macy Gray
3rd - TV star - Melissa Joan Hart
4th - R&B artist - Maya
5th - Ashley Hamilton (son of George Hamilton)
6th - NFL player - Michael Irvin
7th - from Iron Chef America - Mark Decascos
8th - Donny Osmond (made a personal appearance on GMA with Tom)
.

nicole sherzinger confirmed apparently.