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Mariska Hargitay welcomed friends Hilary Swank and Debra Messing to celebrate with her at the fifth annual Joyful Revolution Gala New York City, in honor of the organization she founded, the Joyful Heart Foundation. The non-profit focuses on supporting survivors of sexual assault, domestic violence, and child abuse, a cause that Hargitay became well-acquainted with after working on Law & Order: SVU. Click through to see more stars who stepped out for last night’s hottest parties.

That’s what friends are for! Hilary Swank, Bridget Moynahan and Hugh Jackman were among the stars who turned out to support Law & Order: SVU star Mariska Hargitay at the 2011 Joyful Heart Foundation gala in New York City. Further downtown, Mary-Kate and Ashley Olsen stopped at designer Diane von Furstenberg‘s studio for the annual CFDA members’ meeting before heading over to the Tribeca Grand Hotel to join Rachel McAdams at the Cinema Society’s screening of Midnight in Paris. And speaking of Paris (Hilton, that is) the original celebrity socialite hyped her upcoming reality show at the Hollywood Roosevelt Hotel in L.A. Click through the gallery to see these stars plus Kate Moss, Naomi Campbell and more celebrities inside last night’s hottest parties!  

Kate Hudson gushed about her newfound love and second pregnancy for the new May issue of InStyle magazine, but there’s something else she adores that is purely career-related—the way women work. “I just like the way girls do things,” the actress told InStyle at a weekend press conference for her new movie Something Borrowed. “We really do know how to get things done.” She was, of course, referring to her producer on the film, the one and only Hilary Swank. “Obviously there are so many male producers that I’ve worked with that are just incredible,” she continued. “But watching women multitask I find so intriguing because they’re so damn good at it. It was very feminine. They’re very feminine. It’s not like girls trying to be boys. It was a nice thing to see women as women.” Did you feel that? It’s like she just gave all the multitasking women in the world one big pat on the back! Something Borrowed hits theaters May 6th.

MORE: Kate Hudson’s May InStyle Cover!

— Sharon Clott, with reporting by Andrea Simpson