VIDEO: Ariana Grande Talks Joining HAIRSPRAY LIVE, Performs New Single 'Side to Side'

On last night's TONIGHT SHOW, guest Ariana Grande talked about joining the cast of NBC's HAIRSPRAY LIVE! in the role of Penny Pingleton. "I heard they were doing 'Hairspray Live' and I had a heart attack," gushed Grande. "This has been one of my favorite musicals since I was literally 10 years old. It's very overwhelming."

Later, Grande and Jimmy take the 'Best Friends Challenge' and the singer performs her new song "Side to Side" off her new album "Dangerous Woman." Check out all the clips below!

Earlier this year Grande released her mega-anticipated third full-length album, "Dangerous Woman," which was driven by the title track that reached #1 on both iTunes Overall Top Songs Chart and Top Pop Songs Chart minutes after release. "Dangerous Woman" also debuted in the Top 10 of the Billboard Hot 100 and earned her the distinction of BECOMING the first artist to debut on the chart with the lead single from her first three albums.

As an actress, Grande reprised her "Victorious" role as Cat Valentine in the 2013 Nickelodeon series "Sam & Cat." Last year, Grande co-starred in the FOX series "Scream Queens." In March, Grande was the musical guest on "Saturday Night Live," marking her second appearance on the iconic late-night franchise.

On the stage, Grande was cast as a cheerleader in 2008 in the Broadway musical "13."

Photo by: Andrew Lipovsky/NBC