COVER GIRL: Kim Kardashian, partying with Kourtney, Khloe and Robert at the party for her new Vegas Magazine cover at the Palms Place Hotel and Spa.
LADIES' MAN: Jeremy Piven, surrounded by a gaggle of beautiful women as he danced and drank at New York City's Southside nightclub.
REALITY BITES: Greg Grunberg, feeding former Laguna Beach star Kristin Cavallari a Kahlua cupcake at the Christmas tree lighting ceremony at L.A.'s Grove mall before performing with Band From TV.
SUPPORT SYSTEM: Nicole Richie, coming out to Ecco Ultra Lounge in L.A. to help boyfriend Joel Madden and his brother Benji celebrate the release of Good Charlotte's Greatest Remixes.
HOT TRANNY FOOD: Christian Siriano, having dinner at Comme Ça in West Hollywood.
BLONDE AMBITION: Tom Green, chatting with a mystery blonde at Hollywood's Kress nightclub during the afterparty for the Diversity Awards.
CHILD'S PLAY: Russell Simmons, pledging $25,000 for five necklaces during the Grey Goose-sponsored Keep a Child Alive Black Ball benefit in NYC.
SHIN DIN: Lukas Haas, having dinner at Shin Korean BBQ in Hollywood the night after Nicky Hilton Rothschild and David Katzenberg did the same.
GOOD TIMES: Cheryl Burke, Matthew Perry and Eliza Dushku, hitting the Lo Hi Fi party at Bardot in Hollywood.
TOOL TIME: Raven-Symoné, wandering around a Home Depot in L.A.
LUCKY GUY: Davd Arquette, eating lunch at Mr. Lucky's at the Hard Rock Hotel & Casino in Las Vegas.
DRINK UP: Paris Hilton, doing shots of Herradura tequila with Three 6 Mafia at the Playhouse nightclub's backstage bar at the American Music Awards.
Penélope Cruz will unveil the Unbreakable Kiss Mistletoe installation in New York's Madison Square Park on World AIDS Day, Dec. 1. For every couple that kisses under the mistletoe until Dec. 4, the Diamond Information Center will donate $5 to the Elton John AIDS Foundation.
—Additional reporting by Dahvi Shira and Whitney English