Ashton Kutcher is leaving Earth! The Two and a Half Men star recently signed up to be the 500th "astronaut customer" that will go to space with Virgin Galactic."I gave Ashton a quick call to congratulate and welcome him. He is as thrilled as we are at the prospect of being among the first to cross the final frontier (and back!) with us and to experience the magic of space for himself, Richard Branson, Virgin CEO announced on his blog. But we still don't know the date of Ashton's flight. The estimated price for his space trip is around $200,000 (!). (x17)