During the American Music Awards, Christina Aguilera performed an emotional tribute to the late and iconic Whitney Houston.

Houston's ballads are notoriously challenging to sing, and not everyone thought Aguilera was up to the task. Some viewers even took screencaps of different celebrities in the audience who producers cut to during the performance, a few of whom appeared to be cringing or grimacing.

Including singer Pink, whose reaction face went viral on Twitter.

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Watch Celine Dion's tear-jerking tribute to the Paris terror victims.

Celine Dion brought the house down at the AMAs.

On Sunday, Nov. 22, 2015, Celine Dion performed at the American Music Awards.

Photo by Kevin Winter/Getty Images.

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