Justin Bieber & Selena Gomez, Las Vegas Lovers

Justin Bieber and Selena Gomez  had a lovely Saturday night in Las Vegas.

The reconciled pair took in Cirque du Soleil's Love at the Mirage Resort, and despite the Never Say Never singer wearing a hat and sunglasses, several other people in the audience recognized them, a source tells People.

As RadarOnline.com reported, the on-again, off-again couple are in Sin City to attend the Billboard Music Awards Sunday night.

They're even seated together in the audience, along with their pal Taylor Swift, strategically placed between them.

Come back to RadarOnline for all the details on the Billboard Awards.