Pop powerhouse Kelly Clarkson, hip-hop diva Mary J. Blige and country legend Emmylou Harris will be joining previously announced acts Sarah McLachlan and Metric at the St. Louis stop of the Lilith Fair on Friday, July 16. Others scheduled to perform include folk-pop favorite Ingrid Michaelson, KC rockers Vedera, Jennifer Knapp, Kina and Meaghan Smith. Tickets are on sale this Saturday, April 24; reserved Tickets are $57.50, $103, $133 and $258, while lawn tickets are $47.50. There's also a "Ladies Night Out" four-pack of lawn tickets for $99 while supplies last.