Surprise prank on 'Idol' turns into a super tense moment for Katy Perry and Luke Bryan

On American Idol Monday, things got a little tense between Katy Perry, Luke Bryan and a production assistant, who had been annoying them all day with her antics – noisily banging on the set's grand piano while wiping down the keys and leaving her phone on during auditions.

Eventually, Katy reached her boiling point, when the crew member decided it was snack time during a contestant's audition, loudly crinkling a bag of chips. Katy stood up, walked over to the PA and angrily confiscated the bag of chips, and that's when things got weird.

The face-masked mysterage crew member stomped over to the judges' desk and violently snatched back her bag of chips, while a shocked Luke exclaimed, "Chill!" However, it wasn't until Uncle Lionel Richie got involved, calling security, that Katy finally walked over to the troublemaker to pull her hat off, revealing that it was Luke's wife Carole all along.

Caroline and Luke have a long history, dating back to their college dating years, of pranking each other. In fact, Caroline is even known for her annual "Prankmus" every Christmas. And on Monday, Luke totally fell for it yet again.

“You’ve been punk’d!” cackled Lionel, who wasn’t in on the joke and was just as fooled by Caroline and Katy’s elaborate act.

Video Transcript

[RECORD SCRATCHING]

[WHOOSHES]

[BACKGROUND NOISE]

LUKE BRYAN: Who is rattling the damn--

LIONEL RICHIE: What the hell's going on? Who is that?

KATY PERRY: Thank you. That is enough.

LUKE BRYAN: Who is that?

KYLIE MAR: On "American Idol," Monday, things got a little tense between Katy Perry, Luke Bryan, and a production assistant who had been annoying them all day with her antics.

LUKE BRYAN: Nashville?

LIONEL RICHIE: Nashville.

- Yeah.

[ALARM RINGING]

- Everyone, turn off your phones, please.

- Sorry.

LUKE BRYAN: Sorry, somebody's--

LIONEL RICHIE: What happened?

LUKE BRYAN: An alarm going off.

[CLEARS THROAT]

KYLIE MAR: Eventually, Katy reached her boiling point when the crew member decided it was snack time during a contestant's audition.

LUKE BRYAN: Chill. Who is it?

[MUSIC PLAYING]

[CHIPS RATTLING]

LIONEL RICHIE: Hey, hey.

[BLEEP]

KATY PERRY: Are you good? What the [BLEEP] is that?

KYLIE MAR: But it wasn't until uncle Lionel Richie got involved that Katy revealed--

[MUSIC PLAYING]

[DING]

LUKE BRYAN: Oh my God.

[LAUGHTER]

- Sorry.

[LAUGHTER]

KYLIE MAR: That's right. The entire thing was a prank set up by Luke's wife, Caroline.

LIONEL RICHIE: You've been punked.

LUKE BRYAN: Did you know about this?

[MUSIC PLAYING]

[DING]

God, you baby. Were you in on this?

LIONEL RICHIE: I didn't know anything about this.

KYLIE MAR: Caroline and Luke have a long history dating back to their college dating years of pranking each other. In fact, Caroline is even known for her annual Prankmus every Christmas. And on Monday, Luke totally fell for it yet again.

- After all the stuff he has done to me, he deserves it.

[LAUGHTER]

- I'm sorry.

[WHOOSHES]