Justin Bieber, Selena Gomez

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No surprise, but what happens when Justin Bieber and Selena Gomez are in Vegas, doesn't stay in Vegas.

The sometimes-they're-on and sometimes-they're-off couple attended last night's late show performance of LOVE by Cirque du Soleil at the Mirage in Las Vegas, sources confirm to E! News.

"The pair got close and comfortable in their seats while snacking on peanut M&Ms and Mike and Ikes candy," one of the source said.  "Bieber was sporting a low hat and sunglasses during the show."

Bieber and Gomez are both set to perform at tonight's Billboard Music Awards at the MGM Grand.

"Love you guys... #BBMA tomorrow," the "Come & Get It" pop starlet tweeted yesterday. "#excitednervousanxious."

Meanwhile, the Biebster was spotted rehearsing his set on Friday. "They ordered massive amounts of McDonalds," an eyewitness reports. "And they also got about 10 pizzas for him and his crew."

He put on the charm when he "stopped a song in mid rehearsal to say 'hi' to a group of girls walking by the stage," the source said.

For more Billboards scoop, make sure to come back to E! Online later and tune in to E! News tomorrow at 7 p.m. & 11:30 p.m.

Now we want to hear from you. Do you think Justin and Selena should be together? Leave your comments below.

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