Kelly Clarkson took to Twitter to thank her duet partners Jennifer Hudson (in The Blonds) and Mary J. Blige after belting out tunes for the VH1 Divas Celebrate Soul concert at Hammerstein Ballroom in New York City. "Y'all girls can freaking SING!!!" Clarkson wrote. "I am so lucky to have shared a stage." See more stars at last weekend's hottest events in the gallery!