Rihanna: Lilith Fair's Newest Act!

Rihanna goes au natural as she stops by the studio in Los Angeles on Saturday (April 10). What fun skull pajamas!

The 22-year-old singer will join the 2010 Lilith Tour in Salt Lake City on July 12. Other tourmates include Sarah McLachlan, Colbie Caillat, Emmylou Harris, Erykah Badu, the Indigo Girls, Jill Scott, Kelly Clarkson, Ke$ha, Mary J. Blige, Norah Jones, Sara Bareilles, Selena Gomez, Sheryl Crow, Sia, Sugarland and more.