Kelly Clarkson Covers Britney Spears Hear More Pop Stars Take On Brits Hits Video

Kelly Clarkson broke away from her own set list to sing Britney Spears's "Till the World Ends" during her concert in LA Tuesday night. She's just the latest singer to take on the pop princess's hits - hear Kelly's performance and other pop stars belting out Brit's hits in today's PopSugar Rush.