Celebrity Star Tracks - Monday, January 1, 2007 By People Staff Published on January 1, 2007 10:00 AM Share Tweet Pin Email Trending Videos 01 of 10 GLAMOUR GIRL Bruce Gifford/FilmMagic Britney Spears sparkles at Pure nightclub in Las Vegas where the newly single star hosted a New Year's Eve bash. A rep for the singer denied reports that she fainted at the party, saying: "She was just tired." 02 of 10 SPARKS FLY Sara Jaye Weiss Onetime flames Wilmer Valderrama and Mandy Moore get cozy at Mansion in Miami, where the pair "had their hands all over each other," according to a source. 03 of 10 GIRLS' NIGHT OUT sara jaye weiss Hilary and Haylie Duff, who both recently split from their boyfriends, kick off 2007 at Mansion in Miami, where they partied with a bevy of gal pals. 04 of 10 SHADES DARKER THAN PALE VO/DL/Flynet Mary-Kate Olsen takes her recent platinum locks back to their honey-blonde roots in Los Angeles, where she debuted her toned-down look during a Thursday shopping excursion on Melrose Avenue. 05 of 10 STILL OF THE DAY KADENA PRESS/BAUER-GRIFFIN After a night of clubbing, Lindsay Lohan enjoys a more laid-back activity – lounging poolside – on Friday at the Delano Hotel, where the actress is set to host a New Year's Eve bash Sunday night. 06 of 10 LOUD AND CLEAR Seth Browarnik/WireImage Also in Miami, Wilmer Valderrama pipes up as the host of karaoke night at Mokai on Thursday. Like his ex Lohan, Valderrama is in town to reign over New Year's Eve festivities, hosting a party at Mansion nightclub. 07 of 10 SUN STRUCK Ray Nichols/Splash News Jamie-Lynn Sigler makes waves of her own while enjoying the Florida sunshine Thursday on Miami Beach. 08 of 10 G'DAY PARIS! Paul McConnell/Getty A companion for pup Tinkerbell? Paris Hilton gets her hands on another furry friend – a stuffed kangaroo – while sightseeing in Sydney on Friday. 09 of 10 IT'S THEIR BIRTHDAY Virginia Sherwood/NBC She has the day off, but nothing can tear a disguised Meredith Vieira away from the Today show! Pretending to be Matt Lauer's biggest fan, Vieira surprised her cohost Friday morning for an early celebration: both share the same birthday – Dec. 30. 10 of 10 HOLD ON TIGHT ENF/Fame Catherine Zeta-Jones adjusts her outlook – and her head gear – while enjoying a boat trip with her family on St. Bart's Thursday.