Sia's gearing up to release her new album This Is Acting on Friday, but before that she decided to have a little fun on The Tonight Show

Creating a musical squad of Jimmy Fallon, Natalie Portman and The Roots, the "Alive" chanteuse enlisted her crew to don Sia wigs and perform an unexpectedly awesome cover of famous New Orleans song "Iko Iko," which became a hit in the '60s. 

Sia also performed her new This Is Acting track "Cheap Thrills" on The Tonight Show too. The star gave a vocally impressive rendition of the Ace of Base-sounding track with three dancers delivering interpretative choreography.

While you wait for This Is Acting in full, take a listen to the recently unveiled tracks "Unstoppable" and her Kanye West collaboration "Reaper."