VIDEO: Charli XCX Performs 'Boom Clap/Break The Rules' on AMA's

Last night, Pitbull hosted the American Music Awards, which aired live from the NOKIA Theatre L.A., on ABC. Below, check out Charli XCX's live performance of 'Boom Clap/Break The Rules' and click here for a full list of the night's winners!

Ariana Grande (Broadway's '13') also took to the stage to perform a medley of some of her biggest songs including "Problem," Break Free" and "Love Me Harder," (featuring guest performer The Weeknd). Grande also sang alongside Jessie J performing their hit single "Bang Bang." Lil Wayne was joined by Christina Milian for the premiere of his upcoming single "Start A Fire" from his Tha Carter V album. Wyclef Jean and MAGIC! collaborated on a compilation of their singles "Divine Sorrow" and "Rude."

Stars who presented throughout the evening included Jhene Aiko, Lauren Cohan, Gavin DeGraw, Ansel Elgort, Becky G, Brantley Gilbert, Danai Gurira, Lucy Hale, Ella Henderson, MISS AMERICA 2015 Kira Kazantsev, Mary Lambert, Danica McKellar, Pat Monahan, Kevin O'Leary, Pentatonix, Tracee Ellis Rossand Meghan Trainor. They join a star-studded line-up of performers made up of 5 Seconds of Summer,Mary J. Blige, Garth Brooks, Charli XCX, Fergie, Selena Gomez, Imagine Dragons, Lorde, One Direction,Sam Smith, Taylor Swift and the evening's host, Pitbull. Previously announced presenters include Uzo Aduba, Elizabeth Banks, Aloe Blacc, Jamie Foxx, Julianne Hough, Kendall Jenner, Kylie Jenner, Heidi Klum, Olivia Munn and Taylor Schilling.

As always at the American Music Awards, artists were honored in the genres of Pop/Rock, Country, Rap/Hip-Hop, Soul/R&B, Alternative Rock, Adult Contemporary, Latin, Contemporary Inspirational, Electronic Dance Music, as well as categories for Top Soundtrack, New Artist of the Year Presented by Kohl's, Artist of the Year and Single of the Year.

American Music Awards nominees are based on key fan interactions as reflected in Billboard Magazine and on Billboard.com, including album and digital singles sales, radio airplay, streaming and social activity. These measurements are tracked by Billboard and its data partners, including Nielsen Entertainment and Next Big Sound.