People.com Celebrity Star Tracks: Monday, December 6, 2010 By People Staff Published on December 6, 2010 05:00 PM Share Tweet Pin Email 01 of 15 KONICHIWA! Masatoshi Okauchi/Rex After opening up about her divorce, Christina Aguilera shows Tokyo how to Burlesque while promoting her musical film in Japan on Monday. 02 of 15 LONDON PROWL Mark Cuthbert/UK Press/ABACA Leaving hubby Josh Duhamel at home following his airline incident, Fergie is spotted – literally! – Saturday at the Capital Radio Jingle Ball in the 02 Arena in London. 03 of 15 ON TRACK Ramey Jennifer Garner cheers on her littlest speed racer, 23-month-old daughter Seraphina, on Sunday while big sister – and recent birthday girl! – Violet, 5, takes in the action at a farmers' market in Brentwood, Calif. 04 of 15 MAIN SQUEEZE Kevin Lamarque/Reuters/Landov Paul McCartney and Oprah Winfrey maintain a handy connection Sunday while basking in their Kennedy Center Honors during a presidential reception at the White House. 05 of 15 DO-GOODERS Marc Sterling/Shooting Star Neil Patrick Harris and partner David Burtka leave their twins at home to attend Trevor Live – a LGBQT fundraiser for The Trevor Project – at the Hollywood Palladium on Sunday. 06 of 15 BUTTONED UP 310Pix John Mayer braves frigid N.Y.C. temps on Sunday while shopping with male pals CollegeHumor.com's Ricky Van Veen and Bravo's Andy Cohen in the West Village. 07 of 15 WINTER WONDERLAND Noel Vasquez/Getty Willow Smith belts out her hit song "Whip My Hair" at the tree lighting ceremony at L.A. Live on Saturday. Off stage, her famous dad Will Smith (not pictured) sang along and clapped his hands during the performance. 08 of 15 FAMILY OUTING James Devaney/WireImage Fresh off some time in Paris, Brad Pitt and Angelina Jolie arrive in N.Y.C. and take twins Knox and Vivienne to visit Lee's Art Shop in Manhattan on Saturday. 09 of 15 BELT IT OUT Mark Ashman It's Mariah Claus! Mommy-to-be Mariah Carey gets a jumpstart on her holidays, taping a performance for the Disney Parks Christmas Day Parade at Walt Disney World in Florida on Friday. 10 of 15 ON HOLD John Shearer/WireImage Hug it out! Jake Gyllenhaal warmly greets Blue Valentine star (and former Brokeback Mountain costar) Michelle Williams at her film's L.A. screening on Thursday. 11 of 15 MARRIED CHRISTMAS Michael Rozman/Warner Bros. In preparation for Nicole Richie's impending nuptials, Ellen surprises the future Mrs. Madden on Thursday with flower girl and ring bearer gifts for her kids. 12 of 15 GOOD TIDINGS Ramey Paris Hilton stocks up on holiday essentials Thursday, selecting ornaments from a festive display at Kitson in Los Angeles. 13 of 15 BACK TO THE FUTURE Katy Perry and pal Kathy Griffin find their inner pin-up girls Thursday while rehearsing for VH1's Divas Salute the Troops in San Diego, Calif. The all-American special airs Sunday night at 9 p.m. ET on VH1. 14 of 15 FREE WHEELIN' INF After paling around with his pooch, a heavily bearded Hugh Jackman goes for a pleasure cruise in his West Village neighborhood in N.Y.C. on Friday. 15 of 15 THINLY VEILED Splash News Online Hopefully she didn't have to try anything on! Lady Gaga makes a dramatic exit from a Milan Chanel boutique on Friday, clad in her gothic glam best.