TRUNK SHOW: Ellen DeGeneres and Portia de Rossi, helping a pal celebrate her birthday at Electric Karma, an Indian restaurant on Los Angeles' über-trendy Third Street. Joking about wrapped gifts in the back of their car, DeGeneres said, "We sell art from the trunk of our car just to make a little extra cash."
MUSIC MAN: Joaquin Phoenix, chilling with some musician types at Bungalow 8 in New York City.
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BEAUTY BAR: Jessica Alba, enjoying an 80-minute massage and a 75-minute Ultimate Facial at Ona Spa in L.A.
FANCY FOOTWORK: Adrian Grenier, dancing with the female performer in the interactive show Fuerza Bruta show at New York's Daryl Roth Theatre.
BAY BASH: Steven Spielberg, Tyrese Gibson, Jordana Brewster and Topher Grace, checking out the burlesque show at Transformers director Michael Bay's Dewar's-sponsored holiday party.
FAMILY AFFAIR: Sacha Baron Cohen and Isla Fisher, bringing their daughter to lunch at sushi restaurant Katsu-Ya in Studio City, Calif.
BOY'S TOWN: Sean "P. Diddy" Combs, joining Jamie Foxx's birthday and album release festivities at Tao in Las Vegas.
RAISE THE RUF: Blake Lively, Penn Badgley, Hugh Laurie, Mark Ronson and Sean Lennon, taking in The McGarrigle Christmas Hour Featuring Rufus and Martha Wainwright holiday show at Carnegie Hall.
WATERWORKS: Lipstick Jungle's Kim Raver, being honored at a private reception in NYC for her work as spokeswoman for Volvic and UNICEF's "Drink 1, Give 10," a campaign that helps to provide clean drinking water to children in Ethiopia.
MIDNIGHT MADNESS: Joy Bryant and Lindsay Price, having a good time at the Hornitos Tequila Midnight in the Garden of Agave party in Los Angeles.
BIG SPENDER: Celebrity chef Mario Batali, paying $20,000 for a lunch box decorated by Michael Stipe at the Lunch Box Auction benefiting the Food Bank of New York City.
—Additional Reporting by Dahvi Shira and Whitney English