Pink reacts to her viral ''unimpressed' look during Christina Aguilera's Whitney Houston tribute (PHOTO)

Pink has fired back at claims she was scowling during former rival, Christina Aguilera's tribute to Whitney Houston at the American Music Awards .Until 2016,they spent the better part of a decade battling it out against each other on and off the charts.

Cameras caught Pink's face during the tribute on Sunday evening. 

The 38-year-old singer quickly took to Twitter to confront what some saw as her disdain toward her former industry foe.

She wrote