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Rihanna earned $15 million in 2008
According to Forbes.com, Rihanna earned $15 million in 2008:

“The 21-year-old star spent the last year riding out the success of her third album, Good Girl Gone Bad, which was released in the summer of 2007. The album was re-released in June of last year with additional tracks and remixes. She hit the road in 2008 with Nas and Lupe Fiasco as part of Kanye West’s “Glow in the Dark Tour.” Known for her style, Rihanna also inked an endorsement contract with Gucci last fall.
Earning estimates include income from album sales, touring, endorsement and licensing deals, and television and film roles from June 2008 to June 2009.”