Kelly Clarkson's Billboard Performance - Watch Now!

Kelly Clarkson hits the stage at the 2012 Billboard Music Awards held at the MGM Grand Garden Arena on Sunday (May 20) in Las Vegas.

The 30-year-old entertainer debuted her new song “Dark Side,” which is the third single of her latest studio album, Stronger.

“Just finished rehearsing for the Billboard Awards!” Kelly tweeted the day before. “Looking forward to performing my new single tomorrow for the show!”

This summer, Kelly will be starring as a voice mentor in the new ABC reality show Duets, which airs May 24 at 8 p.m.

FYI: Kelly wore a Roberto Cavalli dress with Amrapali earrings, rings by Solange Azagury-Partridge and Adeler, and an Ista Jewelry band.