Selena Gomez and Justin Bieber shared a tender kiss backstage at the 2013 Billboard Music Awards to the rolling eyes of a disgusted Taylor Swift.

Maybe she was comforting him after he got booed at the ceremony.

What happens is Vegas is supposed to stay in Vegas, but not when it comes to Justin Bieber and Selena Gomez. The star couple who are on-again-off-again relationship were seen together in Sin City.

Selena Gomez and Justin Bieber didn’t sit together at the 2013 Billboard Music Awards at the MGM Grand Garden Arena. They did their best not to be seen together throughout the awards show, but photographs and videos taken backstage after the show depicted a different story. After running into each other behind the scenes, Selena put her arm around the hunky pop star and he gave her a tender kiss on the cheek. The casual and tender moment was caught on Billboard’s online backstage feed after the show.

In the video we can see Justin standing with one of his friends when Selena walks past with her best friend, the country pop singer Taylor Swift. After stopping to talk for a little bit, the video captured Justin putting his arm around the sexy singer and pulling her in for a tender kiss on the cheek. Taylor Swift looks surprised or disgusted by the scene as the video catches her sticking out her tongue in a less-than-happy gesture.

Selena stuck around to chat with Justin after the kiss. It looked like they were catching up after the affectionate greeting. That hasn’t stopped some of their friends from speculating whether the star duo will be getting back together, though. After the couple’s conversation, they embraced again before going their separate ways.

Selena was originally supposed to sit between Justin and Taylor Swift at the awards ceremony last night. The 19-year-old superstar and the former Disney star were also spotted at the Cirque du Soleil's Love show together on Friday night.