Selena Gomez: Music at Mandalay Bay

Selena Gomez sparkles on stage as she performs at the Mandalay Bay Event Center in Las Vegas on Saturday night (September 10).

Earlier in the day, the 19-year-old actress met up with boyfriend Justin Bieber for a low-key date. According to fans (via Hollywood Life), the twosome were spotted at the local mall where they grabbed a bite to eat after browsing the shops.

Selena‘s next stop: Western Washington Fair in Payallup, Wash on Monday, September 12th.

30+ pics inside of Selena Gomez…