Taylor Swift disses Justin Bieber at the Billboard Music Awards

Ouch!

In addition to getting booed by the crowd at Sunday night’s Billboard Music Awards while accepting his Milestone Award, Justin Bieber took a hit from a fellow young crooner: Taylor Swift.

Swift seemed none too pleased when she spotted Bieber giving Selena Gomez — his ex-girlfriend and Swift’s BFF — a kiss on the cheek backstage at the awards show.

The “We Are Never Ever Getting Back Together” songstress was caught on camera making a face and sticking her tongue out as Bieber planted a smooch on Gomez’s cheek — though we’re not sure if Swift’s tongue-lashing was done in real disgust or playful mocking.

In the latest issue of InStyle magazine, Gomez, 20, said her on-again, off-again relationship with 19-year-old Bieber was “crazy and very intense.”

“You can’t help who you date,” she said. “So I wouldn’t swear off that or say that’s what I want again. I don’t know. I’m a kid, and a breakup is normal. I have to go through the emotions and feel it out. I’m doing my own thing, being with my friends, and he’s doing very well too.”

Gomez said “honesty” is what she’s looking for in a future boyfriend.

Meanwhile, Gomez said that Swift, 23, is “like a sister to me.”

“We dated the Jonas brothers at the same time and ended up becoming best friends,” said Gomez, who dated Nick Jonas while Swift dated Joe. “She’s the one I call when I’m having any sort of sadness,” Gomez said. “She’s very nurturing and protective.”