Ashton Kutcher wants you to see Demi in her underwear. John Mayer wants to clear up some misunderstandings about his love life. And Miley Cyrus will convert you to Christianity, with or without the help of Heidi Montag. Stars have found a myriad of uses for their Twitter obsessions, and we've collected some of their best quotes yet. Keep reading for a glimpse inside the celebrity soul.