Ariana Grande - Billboard Music Awards 2013

Ariana Grande goes glamorous for the 2013 Billboard Music Awards held at the MGM Grand Garden Arena on Sunday night (May 19) in Las Vegas.

The 19-year-old actress will be taking the stage later in the program to introduce Justin Bieber!

PHOTOS: Check out the latest pics of Ariana Grande

“Excited for the @Billboard Music Awards tomorrow! My first time going. I’m introducing a certain boy who’s performing *cough* Justin Bieber!” Ariana excitedly tweeted over the weekend.

FYI: Ariana is wearing a Jovani dress.

Make sure to tune in to the 2013 Billboard Music Awards, hosted by Tracy Morgan, airing TONIGHT at 8PM ET/PT on ABC!