Ariana Grande flashes a peace sign while performing onstage during the 2014 iHeartRadio Music Festival held at the MGM Grand Garden Arena on Friday (September 19) in Las Vegas.

During her set, the 21-year-old singer sang her hit song “Problem,” “The Way,” “Break Free,” “Break Your Heart Right Back,” and “Be My Baby.” Watch her full performance below!

After her performance, Ariana changed into a beautiful white dress for the music festival’s after party at 1OAK, celebrating the club owner Richie Akiva‘s birthday.

In case you missed it, watch Ariana and Nicki Minaj perform their latest single “Bang Bang” earlier in the night.