Caught in the Act!

See where the stars (Nicole! Fergie! Leo!) have been seen and heard.
• Nicole Richie, continuing her 25th birthday celebration with a bash at Mr. Chow in Beverly Hills. She arrived with beau Brody Jenner and partied with 50 of her closest pals, including Mischa Barton and Selma Blair. When the birthday girl finally left with her posse at 10:30 p.m., dad Lionel Richie's "Running with the Night" was blasting.

• Leonardo DiCaprio, joining a high-wattage crowd at a fashion show, dinner and party at London's Earls Court hosted by designer Giorgio Armani to raise money for RED, the charity founded by Bono to help fight AIDS and HIV in Africa. 50 Cent (in Armani) reveled for a good cause (and feasted on antipasto and risotto Milanese) alongside Alicia Keys, Beyoncé and Ashley Judd. What was Bono's goal for the night? "Have some fun, try not to fall over."

• A somber-looking Donald Faison, telling a friend while partying at the Tao Nightclub at the Venetian in Las Vegas that he and CaCee Cobb have broken up.

• American Idol star Justin Guarini, performing at a premiere party for the launch of the syndicated series American Idol: Rewind at L.A.'s Spider Club. Former AI contestants Kimberly Caldwell, Mikalah Gordon, Vonzell Soloman, Anthony Federov, AJ Gil, RJ Helton, Jim Varraros and LaToya London cheered him on.

• Thomas Jane, chomping on a cigar at a bash at The Lot club in West Hollywood to celebrate South Park's 10th season. So, where was his wife of three months, Patricia Arquette? "She's working – she's out bringing in the money and I'm going partying."

• Fergie, seeming a bit dazed and confused at an album-release party at New York City club Tenjune. At the fete, fellow Black Eyed Pea Willi.i.am presented the singer with a diamond necklace and tiara. "You can't be a duchess without a proper crown," he told her, making reference to her chart-topping solo album's title, The Dutchess.

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