Star Tracks - Wednesday, April 25, 2007

Proudly showing her support of presidential candidate Barack Obama on her T-shirt, Halle Berry makes a pit stop at a Los Angeles party store on Tuesday.

Nicole Richie moves ahead with a fashionable cause – shopping! – in Beverly Hills on Tuesday. The Simple Life star stopped in the Dior store on Rodeo Drive, where she left a satisfied customer.

Vanessa Minnillo announces her arrival at the Breast Cancer Foundation's annual Hot Pink Party at New York's Waldorf-Astoria on Tuesday. At the event, the MTV host revealed that after four years she's leaving the network's popular TRL show, saying, "I'm ready for the next chapter – what it is, I have no idea."

Sheryl Crow displays a rosy attitude along with Sir Elton John and Elizabeth Hurley at the Breast Cancer Research Foundation's Hot Pink Party. Crow, who performed 10 songs at the bash, proudly told the crowd of beating breast cancer, "Last Sunday was a year from my last radiation treatment – breasts intact!"

Rachel Bilson spruces up her black-and-white ensemble with a dash of red as she shops at Barneys New York in Beverly Hills on Tuesday. The former O.C. star reportedly arrived in style as well, pulling up to the store in a Ferrari driven by her rumored beau Hayden Christensen.

David Bowie and Iman celebrate their 15th wedding anniversary with a glamorous night at a Vanity Fair party, which kicked off the first night of the Tribeca Film Festival Tuesday. The Thin White Duke will have a shot at helming his own Big Apple fest when his High Line Festival debuts next month.

Even on ANZAC Day (which commemorates Australia's role in World War I), Hugh Jackman has his hands full running errands in Sydney on Wednesday.

Next star Nicolas Cage takes a break from the promotional trail for a stroll along New York's Madison Avenue with wife of nearly three years, Alice Kim, on Tuesday.

Decked out in black and white, Justin Timberlake gives a standout performance Tuesday at the Odyssey Arena in Belfast, Northern Ireland, the first stop on his FutureSex/LoveShow tour in the U.K.

With a third child due this summer, expectant mom Julia Roberts isn't slowing down as she makes a quick drop-off in New York on Tuesday.

Carrie Underwood helps Dallas Cowboys quarterback Tony Romo ring in a memorable birthday celebration Saturday at Ghostbar in Dallas. An insider says the Idol champ and Romo were "laughing, singing together, holding hands and their arms were around each other all night." So are they a couple? "They have recently been spending a little time together," Underwood's rep tells PEOPLE, adding, "It's [in the] really early stages."

Hilary Duff manages to keep up with her traveling entourage during a coffee run in Toronto on Tuesday. The singer-actress was on her way to MuchMusic's Live@Much show to promote her album Dignity.

From a recent grocery expedition to a visit at a friend's apartment, Cameron Diaz makes the most of her New York visit on Monday.

Following a near-complete Spice Girls reunion at the christening of Geri Halliwell's 11-month-old daughter Bluebell Madonna, the former Sporty Melanie Chisholm shows she's game for a wilder look as she leaves London's Claridges Hotel on Tuesday.

American Idol castoff Sanjaya Malakar continues his amazing hair odyssey in New York City on Tuesday, where he stopped to sign autographs for fans. The Seattle native has been making the media rounds in the Big Apple, most notably stopping at The Late Show with David Letterman to deliver the evening's Top Ten list.

Lucy Liu looks like she's cut out for the part as she continues filming the new ABC pilot Cashmere Mafia in New York on Tuesday. The former Charlie's Angel star plays a powerful executive in the comedy created by Sex and the City creator Darren Star.