Ariana Grande photographed by Austin Hargrave at Quixote in Los Angeles on July 29, 2014.

"This is the best day of my life. I’m not lying," says Grande about her appearance on "Drag Race."

“This is the best day of my life. I’m not lying,” says Ariana Grande in our exclusive sneak peak of tonight's episode of RuPaul’s Drag Race.

Clearly a Drag Race super fan, Grande blows kisses to the show’s host and executive producer RuPaul. Watch RuPaul introduce Grande in the clip, below:

In the Grande-infused episode, the competing drag queens star in a mystery behind-the-scenes reenactment series. (The contestants are vying for the title of “America’s Next Drag Superstar” and a $100,000 cash prize.) Grande is part of an extra-special judging panel (see photo, below), which includes the return of Merle Ginsberg -- who was a regular judge for the first two seasons of the show -- and current judges Michelle Visage and Ross Mathews.

RuPaul’s Drag Race airs Mondays on Logo TV at 9 PM PT/ET.

Below: Ginsberg, Visage, RuPaul, Mathews and Grande on RuPaul's Drag Race.