Taylor Swift may have had the "craziest" night of any artist at Sunday night's American Music Awards, which was held in Los Angeles and aired on ABC, but it's the unforgettable performances, collaborations, and duets that everyone's buzzing about.

Another of the night's big winners, Nicki Minaj, opened the show by performing "Turn Me On" with David Guetta, which turned into Minaj's hit, "Super Bass." After a few awards were handed out, the performances continued, with a platinum blond Chris Brown belting out "All Back," which then transitioned into "Say It With Me," and Kelly Clarkson singing "Mr. Know It All."

Justin Bieber got everyone in the mood for Christmas with his festive hit, "Mistletoe." The new sensation, The Band Perry, rocked the stage with "If I Die Young," and Katy Perry sang the acoustic "The One That Got Away" sporting all pink, up to her dyed hair. Perry was also handed an achievement award for being the first woman in pop music to have five number one singles from the same album. "Can I just say, thank you so much for letting me be a chameleon this year," Perry said. "I love you so much, and I also love my fans. I want to thank my band and all of the people who came out to see me."

Mary J. Blige brought "Mr. Wrong" to the stage, and Adam Levine performed "Moves Like Jagger" with his band Maroon 5 and collaborator and The Voice cohost Christina Aguilera. The performance that really rocked the evening, however, was Jennifer Lopez's rendition of "Papi," during which the 42-year-old singer and actress was decked out in a nude, sequined, form-fitting body suit. She later performed "On the Floor" with colalborator Pitbull, plus "T.H.E. (The Hardest Ever)" with Will.i.am and Mick Jagger via video feed. Her ex husband, Marc Anthony, appeared just moments later to perform "Rain Over Me," also with Pitbull.

Watch a clip of Perry's performance here:

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