"You are at my party," Paris Hilton told New Year's Eve revelers in South Beach. "The best party in the world!" Miami was the place to be this Dec. 31, as the heiress counted down to midnight at the Shelbourne hotel. Nearby, Wilmer Valderrama did the same at Mansion, where Nick Lachey and Jessica Simpson also rang in the year. And what's a party without Lindsay? Ms. Lohan jetted in after her MTV performance in New York City (right) – and danced the night away with her pals the Hiltons.