Last night, in the first of what undoubtedly will be many surprise collaborations at SXSW 2013, Swedish synth-pop duo Icona Pop was joined onstage by British goth-pop riser Charli XCX for a performance of their hit track 'I Love It.' Charli appears on the single, but this marked the first time the trio has performed the song together live. Even in the brief 40-second clip above, you can practically feel the energy level of the room soar.

Originally released in 2012, 'I Love It' has already racked up more than 10 million views on YouTube. The tune has also been featured on numerous TV shows, and last year, Rolling Stone ranked it 35th on the list of the year's 50 Best Songs.

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