Watch: Britney Spears and Ellen DeGeneres Cause Mall Mayhem

Ellen Degeneres has arguably upstaged James Corden with her latest installment with Britney Spears! 

The talk show queen and pop princess arrived at LA's Westfield Fashion Square shopping mall unannounced for a new segment on Ellen's show, and proceeded to run amok - because "we're celebrities."

The pair attacked store props, snuggled up in a display bed, tried on men's suits, all while pigging out on ice cream.

Watch the hilarious video above!