• PIPE UP
 photo | Rihanna, Sheryl Crow

Credit: Donato Sardella/Getty

Published: Thursday April 19, 2012 06:00 AM EDT

2012

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.