The eclectic group of performers rocked an even more eclectic array of instruments for the lively rendition of the classic, oft-covered song "Iko Iko," and they even found a giant domino to use as a chair! But, really, we cannot get over the wigs.
It might be the most fun musical number you'll this week. Also, it just goes to show that no matter what hairstyle or outfit Portman wears, she always looks absolutely flawless.
Later in the episode, Sia brought the house down with a performance of her song "Cheap Thrills" off her upcoming album,This Is Acting, which comes out on Friday.
The Tonight Show Starring Jimmy Fallon airs weeknights at 11:30 p.m. ET/PT on NBC.