Spotted!

Fall Out Boy frontman Pete Wentz hosted a rockstar New Year's Eve celebration at JET Nightclub at The Mirage, following dinner at Stack with close friends.  Pete helped thousands of partygoers count down to the New Year.  t the stroke of midnight Pete jumped behind the turntables, bringing down the house.

John Mayer toasting his dad who was in the audience while John played with the John Mayer Trio at The Joint in the Hard Rock Hotel & Casino in Las Vegas on NYE.

Laura Prepon and Tia Mowery (The Game on CW) and Tamera Mowry rung in the New Year at Shin in Hollywood, sipping Svedka  cocktails during a performance by artist on the rise Adrian Vera.

Common and girlfriend Serena Williams at the Florida Room at Delano in Miami on NYE.

Leonardo DiCaprio buying five pairs of Carrera sunglasses at Solstice at the Beverly Center.

Diddy at the Viceroy Spa in Miami.

Holly Madison celebrating her birthday at Union Restaurant at Aria Hotel in Las Vegas with a custom flavor from Cold Stone Creamery in her very own “Holly’s Pearls” — peppermint ice cream mixed with white chocolate chips sitting on top of red velvet cake housed within a Cold Stone Creamery original Belgium chocolate cupcake shell, topped with fluffy pink frosting, white chocolate chips, red peppermint flakes and holly leaves.

Audrina Patridge and her sister at RA Sushi Huntington Beach.

Cindy Crawford shopping at Fred Segal Fun in Santa Monica.

Nightlife impresarios Eugene Remm and Mark Birnbaum hosted a New Year's Eve blowout bash at their NYC hotspot, Tenjune, where Ron Browz performed his hit single "Pop Champagne" as partygoers sipped from magnums of bubbly stationed at every table! Partygoers, including Saturday Night Live's Kenan Thompson were shocked when the cast of MTV's Jersey Shore showed up, following their live appearance on MTV's New Year's Eve special.

Mike Myers dining at Emporio restaurant on the Lower East Side in NYC.

50 Cent sipping Hennessy NYE at PURE in Las Vegas.

Chris Brown partying in the DJ booth with Akon and DJ M.O.S at LIV’s New Years Eve Party in Miami’s Fontainebleu Hotel.

At The Bank Nightclub at Bellagio, platinum Grammy-award winning artist, Robin Thicke(wearing a Burberry suit and Ford Sunglasses) rang in the New Year at Las Vegas' most exclusive hotspot, treating hundreds of excited partygoers, including singer Leona Lewis, to a special live performance. During the midnight toast, the R&B crooner watched the ball drop with his beautiful wife Paula Patton (wearing Herve Ledger), his dad Alan Thicke and toasted to 2010 with close friends and family. Earlier in the evening, Robin and his family enjoyed a steak dinner at Fix restaurant.

Over 3,000 people came out to see world famous DJ Tiësto perform at Haze Nightclub's New Year's Eve 2010 bash in Sin City!  The event was the first time that Las Vegas partygoers experienced the newest nightclub at Aria Resort & Casino at CityCenter, the unprecedented urban metropolis on 67 acres on the Las Vegas strip. Haze features state-of-the-art technology that allowed for Tiësto to project such a powerful sound, comparable only to an arena concert environment, for the sold-out party. Additionally, the nightclub's 70ft. wall of high-resolution video generated larger than life imagery and 3D animation choreographed to Tiësto's set.