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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: SVUClick through to see more stars who stepped out for last night’s hottest parties.