It's a big week for Sia, considering her brand-new album, This Is Acting, drops on Friday (January 29), and she's making all the usually promotional stops to get the word out.

On Wednesday, the pop powerhouse took to "The Tonight Show Starring Jimmy Fallon" to perform one of the LP's cuts, "Cheap Thrills," but she also partook in a very collaborative performance alongside Natalie Portman, Fallon and The Roots.

Keeping in theme with the host's usual classroom instrument segment, he rounded up the gang for a different kind of take on The Dixie-Cups' 1965 hit "Iko Iko." With the use of conga drums, spoons, a plastic paint bucket and other household items, the group provided background music for the elusive songstress as she showed off her stellar pipes.

Now, of course, the performance didn't come without a wacky headpiece and a wig because this is Sia we're talking about. Thankfully, the rest of the musical team joined in on the festivity and donned a very classic Sia look as well. Well done, team!

Watch Sia's other performance on "The Tonight Show" below.

Photo: YouTube/The Tonight Show Starring Jimmy Fallon