Rihanna had to pull out of a charity gig after coming down with flu - but is still expected to perform at the Grammys this weekend.
Cee Lo Green filled in for Rihanna at the Women's Cancer Research Fund's annual fundraising dinner after Rihanna cancelled at the last minute.
Green used the gig to warm up his voice and his four-piece, all-female band for his own Grammy performance.
He performed four songs at the star-studded fundraiser held at the Regent Beverly Wilshire hotel.
Conan O'Brien served as host and Annette Bening and Martin Short were honoured at the annual event, which has raised 25 million US dollars for research and education about women's cancers.