Star Tracks - Thursday, December 13, 2007

Paris Hilton gets cracking in the kitchen during her stay in Berlin on Tuesday. The heiress is on a pre-holiday trip abroad to shoot ads for a sparkling wine she endorses and possibly land a new man.

In the midst of their sold-out world tour, the Spice Girls make a pit stop at Los Angeles International Airport on Wednesday, where they were on hand to unveil the new name of Virgin Atlantic's 747 – the "Spice One," the most popular name on the Spice Girls' Web site.

She missed her court-ordered deposition earlier in the day due to "high anxiety" – but that doesn't slow down Britney Spears, who returns to the Four Seasons Hotel in Beverly Hills (where she has been staying) on Wednesday night.

John C. Reilly – who's been touring in character as his pompadour-ed, '50s-era rock character – works the look at the Hollywood premiere of his mock biopic Walk Hard: The Dewey Cox Story on Wednesday.

John Mayer hooks up with HSM stars and real-life couple Zac Efron and Vanessa Hudgens at the afterparty for Walk Hard: The Dewey Cox Story on Wednesday. Also in attendance at the bash held at Hollywood Social: Sacha Baron Cohen and Will Ferrell.

Nightlife Prince William makes a royal exit from London nightclub Boujis on Wednesday, where he hung out with girlfriend Kate Middleton (not pictured) and some friends.

Back from his weekend in Vegas, Brad Pitt gets his motor running Wednesday in Beverly Hills following a meeting at the Beverly Wilshire Hotel.

Maxim magazine's January cover girl Mischa Barton reveals her lighter side – or, at least her lighter locks – in Belfast, Northern Ireland, on Wednesday. She's in the Emerald Isle promoting her period drama Closing the Ring.

Katherine Heigl shows her true colors – and which side of the writers' strike she is on – at the picket lines outside the Paramount Studios in Los Angeles on Wednesday. The actress was joined by her Grey's Anatomy costars T.R. Knight and Sara Ramirez.

Keira Knightley stays bundled up and in step with boyfriend Rupert Friend during a chilly afternoon of running errands in London on Wednesday.

George Clooney, who is in town to receive an honor from the Nobel Peace Prize Laureates, heads to dinner with girlfriend Sarah Larson in Rome on Tuesday.

After strolling with her 4-month-old son Alexander, Naomi Watts leaves the kid at home and heads out with his dad, Liev Schreiber, in New York on Wednesday.

With production of Desperate Housewives shutdown because of the writers' strike, an incognito Nicollette Sheridan is free to tag along with fiancé Michael Bolton Monday in Warsaw, where the singer is was set to perform for the 15th anniversary of a Polish TV station.

Back in L.A., Sheridan's Housewives costar Teri Hatcher spends her free time at the Los Angeles Regional Food Bank, where she stuffed backpacks with food for children in need on Wednesday.

Blending into the night, Jesse James guides wife Sandra Bullock out of Manhattan hotspot Waverly Inn on Tuesday.