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On-again-off-again pop crushes Justin Bieber and Selena Gomez seem to be on again - at least this weekend.  Ahead of their scheduled performances at Sunday night's Billboard Music Awards at the MGM Grand, the two were spotted taking in the sights and sounds of Sin City, attending the Cirque du Soleil performance of "LOVE" at the Mirage hotel and casino on Saturday night. 

A source tells E! News Justin and Selena "got close and comfortable in their seats while snacking on peanut M&Ms and Mike and Ikes candy."  Bieber was reportedly wearing a low hat and sunglasses during the show. 

Reports about the couple ending their two-year courtship first surfaced in January, though they have been seen spending time together on many occasions since then. Last month, Selena met up with Justin on a few dates on his tour in Norway and Sweden.

Selena also recently dished on a new song, which she says is about Bieber.  The track is called "Love Will Remember" and is expected to turn up on her next album Stars Dance later this year. 

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