WATCH: Christina Aguilera Performs ‘Say Something’ at AMAs 2013

Published:10:12 pm EDT, November 24, 2013| Updated:10:02 am EDT, November 25, 2013|

Christina Aguilera and A Great Big World sang their somber duet "Say Something" at the 2013 AMAs tonight. Check out the performance above.

And here's what she looked like on the red carpet:

2013 American Music Awards - Arrivals

See all the best photos of Christina at the AMAs — on and off the stage — here:

And for more American Music Awards performance videos and photos:

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