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House of Lies star Kristen Bell (in Reem Acra) and The Help‘s Ahna O’Reilly represented spring’s hot color trend in bright candy-colored looks at the Alzheimer’s Association’s A Night at Sardi’s event in Beverly Hills, which celebrated the organization’s 20th anniversary. Click through the gallery to see Christina Hendricks, Malin Akerman and more stars at last night’s hottest events.