Karmin Slays The America's Got Talent Stage!

Looks like Olympian Gabby Douglas wasn’t the ONLY star who graced America’s Got Talent last night!
One of our favorite duos, Karmin, stopped by to perform, as the best acts from the show’s YouTube round were picked to move on!
Check out Amy and Nick’s performance (above) of their latest single, Hello!
From posting song covers on YouTube to now performing their own songs on such a huge stage?? Karmin has definitely come a LONG way!
Of course, the two couldn├óΓé¼Γäót leave the crowd with just one song! Take a look at the super cute couple├óΓé¼Γäós Brokenhearted… AFTER THE JUMP!