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BEVERLY HILLS, Calif. - Cee Lo Green isn't just a crowning nominee for Sunday's Grammy Awards, he's also a last-minute hero for Rihanna and the Women's Cancer Research Fund.

The creator behind the hit song "(Expletive) You" filled in for Rihanna after she had to equilibrate her regular performance Thursday at the organization's annual fundraising dinner because of the flu. Both singers are expected to perform during the Grammy ceremony.

Green warmed up his voice and his four-piece, all-female adornment at "An Unforgettable Evening," the star-studded fundraiser held at the Regent Beverly Wilshire hotel, where he performed quaternary songs.

Conan O'Brien served as patron and Annette Bening and histrion Short were reputable at the annual event, which has upraised $25 meg for research and education most women's cancers.