Paris Hilton is all tied up in a revealing new photo she's releasing as an invitation to her birthday party in Las Vegas this weekend (17FEB07). The blonde bombshell posed naked in a light bondage shot for the artwork on the official ticket to the socialite-turned-singer's 26th birthday party at the Hard Rock Hotel + Casino's Body English club on Saturday. Pouting Paris wears only a microphone cord and holds a silver mic provocatively in the sexy shot.