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From Justin Bieber's searing rendition of "As Long As You Love Me" to Taylor Swift's sassy "I Knew You Were Trouble," check out all of the performances from the 2012 American Music Awards. Pro tip: If you only watch one video, make sure it's Christina Aguilera's. 


Usher - Medley - AMA's (40th) by IdolxMuzic
Credit: DailyMotion Photo: Watch Usher Perform "Numb" and "Climax" at 2012 American Music Awards (VIDEO)

Carly Rae Jepsen - The Kiss & Call Me Maybe -... by IdolxMuzic
Credit: IdolxMuzic Photo: Watch Carly Rae Jepsen Sing "This Kiss" and "Call Me Maybe" at the American Music Awards 2012, November 18 (VIDEO)
Credit: YouTube Photo: Watch Taylor Swift Sing "I Knew You Were Trouble" at 2012 American Music Awards (VIDEO)
Credit: YouTube Photo: Watch Ke$ha Perform "Die Young" at 2012 American Music Awards (VIDEO)

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Credit: MTV Photo: Watch Justin Bieber and Nikki Minaj Perform "Beauty and the Beat" at 2012 American Music Awards (VIDEO)
Credit: YouTube Photo: Watch Justin Bieber's Emotional "As Long As You Love Me" American Music Awards Performance (VIDEO)
Credit: YouTube Photo: Christina Aguilera's 2012 AMA Performance of "Lotus," "Army of Me," and "Let There Be Love" (VIDEO)

PSY & MC Hammer - Gangnam Style - AMA's (40th) by IdolxMuzic
Credit: DailyMotion Photo: Watch PSY and MC Hammer Do Gangam Style at 2012 American Music Awards (VIDEO)