[Wizard.]

Shane Dawson - Youtube Reality Star
Lisa Rinna - Ex-soap actress and star of Real Housewives of Beverly Hills
Paris Hilton - Hotel heiress and businesswoman / reality TV star
Caitlyn Jenner - Former Olympian and celebrity trans woman
Jim Parsons - Actor in hit CBS sit-com The Big Bang Theory
Kat Dennings - Actress. Stars in CBS comedy 2 Broke Girls
Neil Patrick Harris - Actor, plays Barney in CBS show How I Met Your Mother
Tiffany 'New York' Pollard - Reality TV star
Rupaul Andre Charles - Drag Queen Mama. (Michelle said he wouldn't do the UK because it was too far to travel, so maybe she can convince him to do this).
Chris Rock - Comedian
Janice Dickinson - Ex-supermodel and reality TV veteran.

I do feel as though even that might be too good for the show. Expect lots of people who are already on CBS shows so that they can do franchise crossovers (for example Eileen Davidson from the RHOB is an actress on a soap called The Young And The Restless which airs on CBS) also celebrities who have hosted competitions on the show before (such as Kathy Griffin, Bobby Moynihan, Gronk) and people from The Amazing Race and Survivor. Think when CH5 puts Ex On The Beach and Geordie Shore people on CBB because the network also owns MTV.