As you'd expect, the results are hilarious, as the guys hold up mirrors to have a rather unconventional interview...and, given the lack of space with all those people crammed in, things got creative.
In the video, 5SOS is given five seconds to say what they're thankful for...only, they don't quite get Guillermo's accent and end up talking about utensils. The One Direction guys got to sing along with the sidekick as they threw it back to Jimmy. Guillermo's a lucky guy.
Other celebs interviewed include Jessie J (in a special "bum to bum" edition), Taylor Swift, Karlie Kloss, Magic, Skylar Grey, Wyclef, Luke Bryan, Ne-Yo, Charli XCX, and Sam Smith (who tried a churro and said it tasted "horrible").
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Gallery | 2014 AMAs Red Carpet Arrivals