Christina Aguilera, A Great Big World Perform "Say Something" at AMAs

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Christina Aguilera and A Great Big World performed their hit collaboration "Say Something" at the 2013 AMAs Sunday, live from L.A.'s Nokia Theatre.

With her hair in a braid and wearing a muted black dress, Xtina offered a fairly stripped-down performance compared to the night's more gaudy showcases.

Watch her do her thing along with the group below ...

Following A Great Big World's performance with Aguilera on The Voice, last week, "Say Something" debuted at No. 1 on Billboard's Digital Songs chart.

The band's debut full-length album Is There Anybody Out There? will be released in January 2014 and has fans already waiting anxiously in anticipation.

What did you think of their AMA performance?

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Still can't get over that they paired up!! This behind the scenes video of AGBW and Christina is sooo cute http://www.youtube.com/watch?v...