Star Tracks - Friday, February 16, 2007

Mariah Carey comes face-to-face with another diva, British supermodel Naomi Campbell, at a party thrown in her honor on Thursday at London's Pinko store. The pop star was celebrating her latest role as the spokesmodel for the Italian fashion house, an honor Campbell once held.

Before embarking on her house hunting expedition, Victoria Beckham turns heads after lunching at The Ivy in Los Angeles on Thursday.

Not a cold or frigid temps can keep Gwyneth Paltrow from hosting a jewelry auction at New York's St. Regis Hotel on Thursday. The cause? To raise money for the city's first American Cancer Society's Hope Lodge, which offers free housing for adult cancer patients. Paltrow is back on the scene after taking more than two years off to focus on motherhood, having just signed on to the new movie Iron Man.

Keith Urban strikes the right chord during his performance Friday on the Today show in New York. The singer also opened up about the support he received from wife Nicole Kidman during his recent stint in rehab: "They say grief makes hearts and closer bonds than joy ever can. We've been through a lot, and she's been extraordinary."

It's a shaving party! Katharine McPhee offers her two model companions a lady's touch at the launch for the Gillette Fusion Power Phantom in New York on Thursday.

Cameron Diaz teams up with former VP Al Gore to announce Live Earth, a 24-hour concert that will take place on seven continents on July 7, during a press conference Thursday in Los Angeles. The concert series is part of Gore's agenda to raise awareness about global warming, an issue Diaz said, "Affects every single one of us."

Justin Timberlake gets a lollipop sugar rush while running errands in West Hollywood on Thursday. The singer, who has been busy collecting Grammy and BRIT awards, resumes his Future Sex/Love Sounds tour Sunday when he hits the stage in Buffalo, N.Y.

So Jennifer Lopez comes out ahead of hubby Marc Anthony in this contest, but the two are still happily in sync at the premiere of Lopez's film Bordertown at the Berlin International Film Festival on Thursday.

Russell Crowe keeps a playful grip on his little man, 3-year-old son Charles, during a family trip to a Sydney, Australia, park on Friday.

Flanked by two male students dressed in drag, Scarlett Johansson rolls with the punch lines as the queen of the parade route Thursday at Harvard University, where she was presented with a Hasty Pudding award. Given by the student drama group of the same name, Johansson joins Ben Stiller (who receives his honor on Feb. 23) as this year's performers who've made a "lasting and impressive contribution to the world of entertainment."

Call her the upright citizen brigade! A chilled-looking Sienna Miller looks ready to tiptoe inside The Late Show's (equally chilly) New York City studio on Thursday, where she sat down with David Letterman to chat about her film Factory Girl.

Eva Mendes plays a spirited game of Pictionary during a visit to MTV's TRL on Thursday, where the Ghost Rider star revealed (in a series of drawings, of course!) her worst habit: nail biting.

She sure cleans up nicely! Paris Hilton gets ready to make a grand entrance at the Opera Ball, Vienna's social event of the season, Thursday night. Earlier, the heiress signed autographs and greeted fans at the Vienna mall and wished her fans a "Happy late Valentine's Day."

Reese Witherspoon does a one-handed juggling act as she shares a sweet V-Day treat with the little man in her life, son Deacon, 3 (not pictured), in Brentwood, Calif., on Wednesday. While Witherspoon has chosen not to comment on the breakup of her marriage, her estranged husband Ryan Phillippe tells talk show host Ellen DeGeneres (in an episode airing Friday) that the split is "the most personally devastating time in (my) life."

She's clearly a bulk shopper! A newly single Mischa Barton rolls away with not one or two, but six bags of groceries after stopping by a Beverly Hills Whole Foods on Wednesday.

After hitting the Grammy afterparties with big sis Jessica, Ashlee Simpson steps out on her own in Los Angeles on Wednesday.