The Aussie rapstress and British indie-pop brat kept the Clueless concept from the song's music video by rocking matching yellow plaid and decking the stage out like a school classroom.
Of course, Iggy looked way too thick and voluptuous to pass for a real schoolgirl, while Charli was like the loner art student who couldn't wait to just graduate and get the f**k outta there.
"Fancy" recently debuted at No. 88 on the Hot 100 and is currently sitting at No. 76 on iTunes. Give it another month, and it could become a proper hit.