Iggy Azalea performed her latest single from Reclassified, "Trouble," on The Tonight Show Starring Jimmy Fallon. The Roots backed Azalea for the funky track while Jennifer Hudson took on the chorus. Fallon and Co. are in Los Angeles all this week, and Azalea's breezy performance had all the workings of a West Coast throwdown.

For those who haven't heard Azalea's whole album, "Trouble" is a throwback groove reminiscent of The Jackson 5's "I Want You Back." The rapper delivers a firm flow throughout the performance, but the main draw is definitely Hudson. She's in prime vocal form, giving Azalea's track just the right amount of soul. "You seem like trouble to me / I can tell by the way that you lean / And the way that you kiss your teeth / And you turn up so fresh and clean / Smells like trouble to me," she sings in the clip below.

As always, props to The Roots for bringing the song to a funky realization. Jack White will perform on The Tonight Show this evening. Will Smith and Rosamund Pike (Gone Girl) will also stop by.

Azalea dropped Reclassified in November. The album is a reissue of her debut effort, The New Classic, and it features five new tunes as well. "Trouble" marks the second time Azalea and Hudson teamed up on a track, having already worked together on "He Ain't Goin' Nowhere" from the latter's September release, JHUD.

"The new tracks have star power too: 's glacial chorus hook offsets the menace of 'Beg For It', actress Jennifer Hudson brings soulful sass to the piano-led 'Trouble' and Ellie Goulding makes the reedy electronica of 'Heavy Crown' sound even more like it's been shat out by angry androids. A mild improvement," NME wrote about Reclassified.

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