Stars attend 'An Unforgettable Evening' cancer fundraiser (13 images)

Celebrities attend "An Unforgettable Evening" benefiting the Women's Cancer Research Fund at the Beverly Wilshire Hotel in Beverly Hills, Calif., on Thursday.

Actress Renee Zellweger received the Courage Award at the event. Photo by Jim Ruymen/UPI

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Hotel heiress Paris Hilton. Photo by Jim Ruymen/UPI

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Hotel heiress Nicky Hilton. Photo by Jim Ruymen/UPI

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Actress Rita Wilson. Photo by Jim Ruymen/UPI

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