"Tonight, we pay tribute to Whitney and the enduring music from The Bodyguard with a performance by another artist with a mesmerizing voice with a medley from that film". When Aguilera first took the stage, she struggled to find the right tempo and key to "I Will Always Love You".
But Pink was having none of it, and was even seen later in the medley softly singing along as tears visibly welled in her eyes.
After the show, Christina posted a video thanking Whitney Houston's family for allowing her to perform the tribute and "making a little girl's dreams come true".
The cameras cut to Pink again later in the song, and her expression had by then softened - she was shown smiling and applauding.More news: We can refuse Trump nuke order, says United States commander
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P!nk's apparent reaction went viral with many thinking she was not feeling the performance.
Pink and Christina Aguilera are so good.
Aguilera swung on her in a club, said Pink, adding that they later settled their differences. This August, P!nk shut down any Aguilera hate surrounding her VMA Vanguard Award win, tweeting "I [heart] Xtina".
Aguilera takes on this honor for the late Houston, who won 22 AMAs in her lifetime, securing Houston as the most awarded female vocalist of all time. "We've made amends." Apparently, the AMA's didn't get the memo and they may or may not have been trying to stir up some controversy by cutting away to P!nk's reaction repeatedly during the performance.