People.com Celebrity Star Tracks: Friday, January 7, 2010 By People Staff Published on January 7, 2011 05:00 PM Share Tweet Pin Email 01 of 16 BALANCING ACT Swarbrick/Donnelly/INF Jessica Simpson strikes a familiar pose on Thursday, narrowly making her way between sidewalk subway grates in New York City. 02 of 16 COLD COMFORT Splash News Online Brrr! A hooded Sandra Bullock leans in for a nuzzle with son Louis, 11 months, braving the icy elements in New York on Thursday before the city's next big snowfall. 03 of 16 STREET TEAM Fame Newlywed Joel Madden makes his college allegiance clear on Thursday, sporting Indiana University gear while out in Los Angeles with daughter Harlow, who turns 3 next week. 04 of 16 WELL SUITED Tannen Maury/EPA/landov Channing Tatum looks suave in a classic suit at the Chicago premiere of The Dilemma on Thursday. Later, the gracious star re-Tweeted pics of him posing with fans on the red carpet. 05 of 16 OWNING IT Frazer Harrison/Getty What doesn't she own? Oprah Winfrey hits the red carpet Thursday to promote her new self-branded network, OWN, at the TCA Winter Press Tour cocktail party at the Langham Huntington Hotel in Pasadena, Calif. 06 of 16 'HORN' BLOWER Henry Lamb/Photowire/BEImages Green Hornet star Seth Rogen poses with his pimped-out superhero ride, Black Beauty, in N.Y.C. on Thursday. The crime-fighting caper, costarring Cameron Diaz, opens Jan. 14. 07 of 16 NIGHT OWL BigPictures/X17 Madonna proves she's a true Material Girl Thursday night, stepping out in a leather ensemble while partying with pals at London's Aura nightclub. 08 of 16 WEEKLY READER Orchon/Retna Nicole "Snooki" Polizzi ditches the poof to promote her new book, A Shore Thing, at Barnes amp Noble in Los Angeles on Thursday, just hours before the explosive season premiere of her reality hit, Jersey Shore. 09 of 16 INSPI(RED) WENN Red-y or not, here she comes! Rihanna makes a stylish jaunt to Fred Segal in Santa Monica, Calif., on Thursday with a pal. 10 of 16 DRIVER'S ED EM43/Splash News Online Gwen Stefani teaches son Zuma, 2, the rules of the road during a Beverly Hills playdate on Thursday. 11 of 16 IT'S CASUAL Matei H/Keola/Scott A/Bauer-Griffin After glamming up for the People's Choice Awards, mom-to-be Natalie Portman opts for a casual Thursday in Los Feliz, Calif., with her mom Shelley and pup Whiz. 12 of 16 SNOW BUNNIES Splash News Online Tori Spelling leads the way for daughter Stella, 2½, on the slopes while vacationing in Lake Arrowhead, Calif., on Thursday. "She did amazing," Spelling Tweeted of her little snow bunny. 13 of 16 SHE'S STRAPPING Splash News Online No pants, no problem! Lady Gaga keeps her favorite trend alive on Wednesday, performing a gig at N.Y.C.'s Oak Room in a corset and ... very little else. 14 of 16 AHOY, MATEY John Lamparski/WireImage Gossip Girl star Jessica Szohr offers a cute curtsy in monochromatic mini Thursday at CampC studios in New York. 15 of 16 FUELING UP Kevin Perkins/Pacific Coast News A java-toting Emma Stone takes a much-needed coffee break Thursday as she continues to film the upcoming Spider-Man movie in Los Angeles. 16 of 16 UNDER COVER Fame After a glamorous appearance at the People's Choice Awards the night before, Kim Kardashian gets back out there and goes to work Thursday in Beverly Hills.