Kelly Clarkson was at Britney's Show last night!

"Britney: Piece Of Me" (30/12/14) Kelly Clarkson pic.twitter.com/vX9jz3buhq
— - Britney Bitch! ♔ (@BritneyMyPretty) December 31, 2014

Source: Twitter Account: @BritneyMyPretty