Where the Stars Are Partying New Year's Eve By Mary Margaret and Jon Warech Whether they're steaming up Miami or keeping warm in New York, celebs will usher in the new year in high style. Here are some of the hottest places to count down to 2007 across the country. MIAMI: Lindsay Lohan has been snapped chilling poolside at the Delano Hotel, so it's only fitting that she's set to party at the South Beach hot spot alongside celebs such as Michelle Trachtenberg, Taye Diggs, Kimberly Stewart, Maxwell and Sofia Vergara. At Mansion, DJ AM, Travis Barker and Lohan's ex Wilmer Valderrama will reign over the festivities. As Valderrama tells PEOPLE, "What's a better way to celebrate a great year than coming to Mansion?" Jared Leto will helm the party at the Raleigh Hotel, owned by Uma Thurman's beau Andre Balazs, where guests can mingle in an open-air beachfront bar. Luke Wilson, Jamie-Lynn Sigler, Robert Iler and Tyson Beckford will celebrate at Skybar as rapper Q-Tip plays emcee. At Setai, Jessica Alba, Haylie Duff and The O.C.'s Benjamin McKenzie will host a poolside soiree with sounds by celeb DJ Steve Aoki. Adrian Grenier plays a movie star on Entourage, but he'll be playing rock star at the Hotel Victor when he performs with his band the Honey Brothers. Ludacris will rock a party at Social Miami at the Sagamore Hotel hosted by Venus and Serena Williams. LAS VEGAS: Talk about out with the old: Britney Spears will usher in the New Year with a bash at Caesars Palace's PURE nightclub the backdrop for Kevin Federline's "Lose Control" video. Ouch! Good Charlotte frontman Joel Madden will take over the deejay booth at Ghostbar on the 55th floor of the Palms Casino Resort. Will new squeeze Nicole Richie be there to kiss him at midnight? Battle of the exes: Pamela Anderson will host a bash at Tao at the Venetian while her soon-to-be ex-husband Kid Rock parties across the street at The Mirage's Jet nightclub and first husband Tommy Lee performs with Rock Star: Supernova at The Joint at the Hard Rock Hotel and Casino. As he did in 2005, Vince Vaughn will bring his Wild West Comedy tour to Mandalay Bay. This year, John Favreau will join him onstage to mark the 10-year anniversary of Swingers, the movie that made them famous. "Vegas, Baby!" NEW YORK CITY: In Times Square, Carson Daly will count down to midnight on NBC's New Year's Eve with Carson Daly, featuring a performance by rockers Panic! At the Disco, while Christina Aguilera belts in the New Year for ABC's Ryan Seacrest-hosted Dick Clark's New Year's Rockin' Eve (Fergie, Natasha Bedingfield and Meat Loaf are also slated to perform). After her Times Square show, Aguilera will head over to the Hudson Hotel to guest host a party co-sponsored by Heineken (her husband, Jordan Bratman, already requested eight cases Heineken Light). Mira Sorvino will party with The Sopranos' Federico Castelluccio as well as Elias Koteas, Caroline Rhea and ... her dad, Paul Sorvino, at Nikki Beach Midtown. The ultra-exclusive Room Service will open its doors for a bash hosted by MTV'S Damien Fahey. Revelers can reserve one of the nine private suites complete with leather couches, a mini-fridge, a plasma TV and DVD player, and a concierge. Come 3 a.m. guests will even be served a gourmet breakfast. Now that's service!