Rihanna has added her name to music's biggest show of girl power - she'll be part of this summer's (10) Lilith Fair festival tour.

The R&B star will make a special appearance at Lilith’s Salt Lake City concert in Utah on 12 July (10). The 36-city tour will commence in Calgary, Canada on 27 June (10) and feature acts including Lilith Fair co-founder Sarah McLachlan, Emmylou Harris, Loretta Lynn, Beth Orton, Erykah Badu, Mary J. Blige and Sheryl Crow. Rihanna's Lilith date will come during her upcoming Last Girl On Earth North American tour. (KL/WN/MT)

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