Rapper Cee-Lo Green attends the Woman's Day 8th Annual Red Dress awards at Jazz at Lincoln Center on February 8, 2011 in New York City.

*Cee Lo Green became a hero at a cancer charity event last night after stepping in at the last minute to perform in place of Rihanna, who had to pull out due to a bout with bronchitis and laryngitis.

Rihanna was booked to sing five songs at the Women’s Cancer Research Fund’s annual fundraising dinner. Instead, the artist behind the hit song “F*** You” brought along his four-piece, all-female band and filled in for RiRi with four tunes.

Dubbed “An Unforgettable Evening,” the star-studded fundraiser was held at the Regent Beverly Wilshire hotel and was hosted by Conan O’Brien. Annette Bening and Martin Short were honored at the annual event, which has raised $25 million for research and education about women’s cancers.

Rihanna’s camp says she will do all she can to fulfill her commitment to sing at the Grammy’s on Sunday. “I’m still goin to (Grammy) rehearsals tho! Sunday is everything,” she tweeted.

She was forced to cancel her 2009 Grammy performance at the last minute after she was attacked by her then ex-boyfriend Chris Brown following a per-Grammy event.

Travis Barker and Rihanna Twitpic, March 23, 2010

In other Rihanna news, MediaTakeOut.com is claiming that she and drummer Travis Barker are now dating following a longtime friendship.   The site cites sources who say they went on a few dates years back.

Rihanna and Travis reportedly have a photo shoot coming up together and Rihanna will reportedly be in his upcoming video for “Can A Drummer Get Some?”