Taylor Swift was seen sticking her tongue at Justin Bieber and Selena Gomez's embrace at last night's (May 19) Billboard Music Awards.

The Canadian and the 'Come & Get It' star are said to be single after years of dating but they shared an awkward hug backstage at the Las Vegas event.

It looked as if Bieber went in for a kiss on the lips, but Gomez sidestepped it and planted one on his cheek.

As the embrace took place, Taylor Swift happened to be walking by after entering the room with Gomez - and she stuck out her tongue in apparent disgust at the embrace.

The 'Red' star meanwhile also snubbed a question about Bieber during a press conference at the event.

She was asked about the 'Believe' singer winning the Milestone award - to which she said: "Can we have another question?"

Swift trumped the Canadian in the award stakes, winning eight gongs in total. Watch Taylor Swift stick her tongue out below: