Taylor Swift's disgusted reaction to Selena Gomez and Justin Bieber kissing backstage at the Billboard Music Awards has gone viral. The singer unleashed her true feelings about her friend's hook-up with the 19-year-old pop star with a ridiculous facial expression that was caught on camera - for us all to enjoy.

Swift, who won the night's biggest honor for artist of the year, was walking backstage with Gomez when they bumped into Bieber. A couple of bodyguards blocked the exchange but when Gomez gave her ex-boyfriend a hug and a peck on the cheek, Swift stuck her tongue out in mock horror before becoming visibly impatient. Selena was pulled away while Bieber is seeking asking a member of his entourage to block one of the cameras from recording him before stepping out of frame. 

Gomez, 20, and Bieber, 19, have been on-off for several years though were thought to have ended their relationship on New Year's Eve. She's been spending more and more time with Swift, 23, who has dated.well, pretty much everyone. Harry Styles was the latest heartthrob to get the boot. 

Check out Taylor Swift's disgusted reaction to Selena Gomez and Justin Bieber at around the 1.01 mark in the video below:

Overall, it was a bittersweet night for Justin Bieber who scored two wins and performed a couple of times though was booed by raucous audience members when he accepted the first ever Milestone Award.

taylor swiftTaylor Swift With Her Slew of Billboard Music Awards

Selena Gomez
Selena Gomez At The Billboard Music Awards 2013