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  • PIPE UP
 photo | Rihanna, Sheryl Crow

Credit: Donato Sardella/Getty

Published: Thursday Apr 19, 2012 | 05:00 PM EDT

PIPE UP

Rihanna gets impromptu backup vocals from honoree Sheryl Crow at an event called "An Unforgettable Evening" in Beverly Hills benefiting EIF’s Women’s Cancer Research Fund.