Jean Dujardin beats George Clooney for best actor and Mary Tyler Moore receives lifetime achievement award at the 18th Annual Screen Actors Guild Awards; Sofia Vergara and Meryl Streep have fun with friends at the Weinstein Company and Dewar's post-SAG Awards cocktail party at the Chateau Marmont; Amber Heard dazzles fans on the red carpet as Kelsey Grammer hosts the 64th Annual Directors Guild of America Awards; Katy Perry and professional party girl Paris Hilton kick off the grand opening of 1 OAK Las Vegas; More»

Having penned a hit single about "Waking Up In Vegas," Katy Perry knows all about the unintended consequences of a late night in Sin City, and as sad as it may seem, she's far from the first person to blow five figures in a night out at an exclusive Vegas nightclub. But in a refreshing twist on the usual debauchery, the $50k that Katy and her BFF Markus Molinari dropped at the 1OAK grand opening on Friday night didn't go to remodel Gavin Maloof's guest cottage or pay off Floyd Mayweather's gambling debts; it went straight to GiveLove, a charity doing humanitarian housing and sanitation work in Haiti. More»

A plunging neckline-wearing Jennifer Aniston, Elizabeth Olsen, Amber Heard, and Reese Witherspoon step out for Elle's salute to women; Kristin Cavallari celebrates her new gig with Chinese Laundry at The Redbury; Julie Bowen and Jason Alexander attend a cabaret to raise funds for breast cancer research; Lauren Santo Domingo, Selma Blair, and a bunch of other chic people gather in Bel Air to party with Derek Blasberg—special things happened all over town yesterday so get all the details in this edition of Last Night's Parties.

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Another day, another grand opening of a store at Santa Monica Place. But last night's Kenneth Cole one kind of blows the others out of the water with a Taio Cruz concert. Meanwhile on the other side of town, Soho House hosted an exclusive Sony Cierge Holiday Preview gadget dork-out for VIPs to play with some new toys. And somehow Jamie Kennedy made it to both despite yesterday's hideous traffic. More»

via la.guestofaguest.com: Not everyone was in LA for Coachella...Tory Burch, Lauren Santo Domingo, and Derek Lam were among the New Yorkers who headed out West for the joint Tod's/Lacma celebration last Thursday. MORE>>

[Photos by BILLY FARRELL for PMc]

The Fashion Group International hosted their "Night of Stars" 2008 Gala: The Alchemists last Thursday at Cipriani's on Wall Street.  Attendees included J.Lo and Marc Anthony, Prince, Karl Lagerfeld, Ashley Olsen, Blake Lively, Kate Bosworth, Anna Wintour, Margaret Hayes, Georgina Chapman, Donatella Versace, Debra Messing, Ivanka Trump, Allegra Versace, Francisco Costa, Franca Sozzani, Hugh Dancy, Jared Kushner, Penn Badgley, Andre Leon Talley, Kerry Washington, Lindsay Price, Alexis Avery, Alexandra Adame, Alan Kronberg, Nancy Chilton, Balthazar Getty, and Alexander Wang, among others.