Katy Perry gets booed by American Idol's audience for THIS reason

One is a firework, unless they use tonnes of glitter, according to Perry.

Katy Perry was booed on Monday night's episode for her slightly scathing critique of a Top 26 contestant. 

Nutsa Buzaladze who took to the stage in a sparkly dress and boots to sing Grace Potter and the Nocturnals' (ITAL BIS) Paris (Ooh La La).

Scrutinizing her look, Perry told Buzaladze blatantly, "Nutsa, every time you take the stage, it's like you glitter bomb the stage. Listen, I think that one thing I personally would like to see from you is not one piece of glitter the next time. I know that's gonna be hard."

What resulted was a chorus of boos from the audience at the Disney Aulani property in Hawaii. 

Buzaladze tried to seek an exception for Perry, asking, "Liner? Maybe eyeliner?"

Fellow judge Luke Bryan was excited to see Perry getting some pushback from the audience, and since this marked the first time she's ever been booed in her tenure as a judge on the show. "Yes! Katy got booed!"

Added fellow judge Lionel Richie: "Whoa, hostility!"

Perry smoothly reacted to it and did not relent to Buzaladze's request for eyeliner. "Okay, first time in six seasons," she said of the booing in order to assuage the awkwardness. 

"Whoo-hoo! But what I'm saying is that I'd like you to flip the script. I think we want to be, like, pulled in by our hearts, too. I'd love to see that, and I think America might, too."

The point may be correct albeit humorous. 

Perry often seemed to have cornered the market on glitter in her personal outfits and covers; in her own CoverGirl makeup collection, which included actual pots of glitter.

Katy Perry Embraces Nutsa Buzaladze on American Idol: 

This contestant had another notable moment with Perry earlier this season. The acclaimed judge hugged a visibly down Buzaladze after she apologized for a less-than-stellar performance in the duet rounds. 

"I wanted to tell my side of the story and I felt so bad I was frozen. I didn't want to bring negative energy so that's why I didn't say nothing," Buzaladze said. "I didn't speak up because I didn't want to cry on stage. But after I left the stage I was just destroyed. So I wanted to apologize for that."

Moreover, Perry remarked, "That's so wonderful, and Nutsa, what I meant about grace is that it's okay to be determined and ambitious and edgy and strong but also with grace.

"I really relate to you because I know what it means to be a strong woman, to want to be strong and to never break and to never feel like anything can ever get to me, but that's not real. I think that they're seeing that you're a real person with a big heart and a big talent."