I'd have to say Mariah Carey, she gets on my nerves. The backstreet boys were fucking gay and so were Nsync- I hate boybands. The cheeky girls need putting to sleep (permanantly). I could go on forever. As for actors/actresses I hate the fake-ass phoney ones who are up their own arses like Brad Pitt, Liz Hurley, Tom Cruise, Keanu reeves. The dumbest actors ever though have to be -

steven seigal
Chuck Norris

Their movies are appalling.