Justin Bieber and Selena Gomez made sure to be seated apart and not seen together throughout the entire 2013 Billboard Music Awards show.

However, backstage it was a completely different story for Selena Gomez and Justin Bieber.

After bumping into one another, Selena Gomez put her arm around Justin Bieber to lean in and give him a tender kiss on the cheek.

Selena Gomez and Justin Bieber’s casual meet up was captured on Billboard’s online backstage video feed after the show.

In the video, Justin Bieber is seen standing with one of his pals, as Selena Gomez and her best friend and fellow singer Taylor Swift walk past.

Selena Gomez stops to talk to Justin and puts her arm around him and pulls him in for a kiss on the side of his face.

In the video it also appears that Justin Bieber tries to pull her in for a kiss on the lips before Selena Gomez seemingly pinches him on the cheek.

Following the smooch, Taylor Swift is seen sticking her tongue out in a gesture of either surprise or disgust over her friend’s actions.

Selena Gomez and Justin Bieber then continue to chat for some time, looking like they are catching up.

While Taylor Swift waits patiently for them to finish their conversation, a red head woman tries to pull Selena Gomez along but she is keen to keep chatting to her former beau.

The pair finally part ways after embracing each other again with Selena Gomez nodding several times.

Selena Gomez kissed former flame Justin Bieber on the cheek backstage at the 2013 Billboard Music Awards in Las Vegas on Sunday night

While the duo affectionately greeted one another, the meeting however appeared more like friends catching up rather than a couple conversing after getting back together.

However, after the backstage cameras caught the moment, Justin Bieber noticed he was being filmed and quickly tried to shoo away and cover up the cameras with his hand.

Meanwhile, Selena Gomez later posted the picture on her Instagram account, proudly captioning it: “Vegas hug + kiss.”

The pair’s meeting comes after they managed to avoid being photographed or seen together all night.

Selena Gomez was originally set to be sitting next to Justin Bieber at the awards ceremony on Sunday night.

Justin Bieber and Selena Gomez had appeared to had patched things up since their split in the New Year and were expected to go public at the annual music awards in Las Vegas.

According to Us Weekly, a source revealed Selena Gomez would be sitting on the front row at the MGM Grand Garden Arena right next to Justin Bieber, with her close friend Taylor Swift on her other side.

The insider said it was “clearly no accident”, adding: “Their camps must have requested this seating arrangement. No way would it have happened without their go-ahead.”

However, when the awards ceremony commenced, Justin Bieber and Selena Gomez were not seated together, instead sitting across the aisle from one another.

Rumors had been circulating the pair were back together since they were caught kissing backstage in Norway, and were then seen cuddling in a picture uploaded to Instagram by Justin Bieber last month before he deleted it.

Justin Bieber, 19, and the 20-year-old former Disney starlet arrived in Vegas early, and were apparently spotted at the Cirque du Soleil’s Love show together on Friday night.

The Baby hitmaker tried to enter the Mirage venue incognito, but was rumbled when an onlooker shouted out his name.

Justin Bieber then spent the entire night “nuzzling right into” his former girlfriend Selena Gomez as they snacked on M&M chocolates, People magazine reported.

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