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"  Ariana Grande performed her hit &amp;quot;Problem&amp;quot; on Sunday at the Billboard Music Awards, and it was ***flawless. Iggy Azalea stopped by in a cheerleader outfit to do her guest verse (after doing her own hit &amp;quot;Fancy&amp;quot; with Charli XCX). If you did not know before that &amp;quot;Problem&amp;quot; would be the song of the summer in 2014, now you do.         RELATED: See All the Looks From the 2014 Billboard Music Awards The Ultimate Fan Guide: Ariana Grande 34 of Ariana Grande&amp;#039;s Cutest Looks Follow Eliza on Twitter.  Photo credit: Getty Images "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.cosmopolitan.com/entertainment/celebs/news/a25401/ariana-grande-problem-bbmas/>