Ariana Grande [1] wowed the crowd at this year's American Music Awards [2] — and not only because she looked fabulous. The singer performed a stripped-down version of the normally upbeat "Problem," complete with vocal support from The Weeknd. It's a pretty great rendition, and she had a lot to follow, with both Lorde [3] and Iggy Azalea [4] nailing their songs as well. Take a look at the performance below to relive the action all over!

Source: Getty / Kevin Winters [5]