Some stars might be too big to be impressed by royal weddings. Paris Hilton revealed to ET why she’ll be sleeping on April 29 during Prince William and Kate Middleton's early morning "I do's."With two major projects in the works, Hilton admitted on Thursday at the Hollywood Domino gala that she won't have the energy to stay awake for the 3 a.m. PST ceremony, but her new show does allow her to attend a few Oscar parties this weekend."I'm filming my reality show so I'll be doing some work and attending some parties as well," Hilton said. (ETonline.com)