My thoughts/guesses
US Sitcom Star - David Spade
Shock Jock - Waleed Aly
AFL Legend - Jason Akermanis
Much Loved Olympian - Dawn Fraser
Pop Diva - Natalie Bassingthwaite (big name on TV clue)
Aussie Comedian - Merrick Watts
Singing Sensation - Casey Donovan
Reality Star - Keira MacGuire
Famous Australian Actor - Shane Jacobson (had a bit part in the Bourne Legacy)
Beauty Queen - Tahan Lew Fatt
Most are names already in this thread then a couple of left field options
I agree completely with Aker, Keira and Tahan. The only reason I said Rosso as opposed to Merrick was because Merrick had a drive time show on Triple M radio last year. The major thing making me thing the pop diva is NOT Nat B is that they are overloading the clues etc. so it seems like it is her. I think (and hope) it is a deception