American Idol: Katy Perry shows split in back of her pants

Katy Perry unexpectedly put on the biggest display on Monday's episode of American Idol as she showed off a huge split in the back of her pants.

The 33-year-old pop superstar wore a truly eye-catching silver top and pants for the key round where half of the remaining 24 got to perform duets with their own idols to try to get to the final 14.

But the I Kissed A Girl singer soon discovered her dazzling outfit's limitations when she tried to tease co-star Luke Bryan by standing and sitting to mimic his actions.

Silver siren: Katy Perry stole the show on Sunday's episode of American Idol as the back of her pants ripped

Silver siren: Katy Perry stole the show on Sunday's episode of American Idol as the back of her pants ripped

'I just split my pants!' Katy suddenly screeched in the middle of his critique of a performer, adding after an awkward pause: 'I'm sorry ... not really.'

Katy then proved she was not playing when she stood up -- and gave a full view of the split backside of her pants, with her modesty covered by an American Idol logo on screens while the shocked looks of those in the audience proved there was plenty to see.

Her fellow judges screeched with shock and obvious amusement, with Luke pretending his eyes hurt as he looked away laughing.

Lionel Richie, meanwhile, laughed as told the audience 'don't go to the exits yet!'

Strategically placed: A strategically placed American Idol logo covered up Katy

Strategically placed: A strategically placed American Idol logo covered up Katy

Looking away: Lionel Richie and Luke Bryan looked away as Katy's pants split

Looking away: Lionel Richie and Luke Bryan looked away as Katy's pants split

Good times: Maddie Poppe who was being critiqued by the judges and host Ryan Seacrest looked on as Katy split her pants

Good times: Maddie Poppe who was being critiqued by the judges and host Ryan Seacrest looked on as Katy split her pants

Audience reaction: The studio audience in Los Angeles also reacted to the wardrobe malfunction

Audience reaction: The studio audience in Los Angeles also reacted to the

'Tape it! Tape my butt!' Katy pleaded, with a female crew member finally coming to the side of the stage and helping her come up with a quick fix to hide her modesty.

The night saw the contestants get a rare opportunity to sing with some of the biggest names in music -- but with Toni Braxton and Jessie J both falling sick at the last minute sending some of the contestants in a panic.

They were helped out instead by last-minute replacement Allen Stone as well as country star Cam, joining other real-life idols Lea Michele, Rachel Platten, and Banners.

Emergency repair: The pop star asked for someone to tape her butt

Emergency repair: The pop star asked for someone to tape her butt

But the episode was an even bigger deal for stars Bebe Rexha and Colbie Caillat -- both of whom had previously unsuccessfully auditioned for the show before finally finding fame on their own.

'The funny thing is I auditioned for American Idol, but I didn't make it,' Bebe told contestant Amelia Hammer Harris who praised her for 'paying it forward' now as a star.

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'So for all of you watching out there -- you just never know! And here we are,' Bebe told viewers.

Colbie Caillat, meanwhile, admitted: 'I auditioned for American Idol twice.

'I actually came in with my song Bubbly. But I wasn't ready at all, I had such stage fright and I realized I had a lot of work to do with myself,' she told contestant Maddie Poppe.

Calling finally making it to Idol 'pretty bizarre,' the irony was only heightened when the 22-year-old Colbie got to perform her hit Bubbly -- the song she said she first brought to Idol when she auditioned aged 17 -- on the big stage.

Katy used their stories for words of encouragement for the five performers who were let go at the end of the night.

'You guys are all phenomenal singers-slash-stars, and you got to duet with a couple of people tonight that never made it on the show that are bonafide stars,' she told them. 'So if that doesn't give you a greater example of, like, "I can do it"...'

Young rocker Mara Justine, 15, was first to get sent through to the next round after an emotional performance with Rachel Platten and her retooled hit Fight Song that the youngster cracked with tears at the end.

And she was not the only one, with host Ryan Seacrest coming on with watery eyes, his voice cracking as he said: 'I'm gonna cry! That was... like, don't ever end!'

Idol auditions: Duet guests Bebe Rexha and Colbie Caillat both revealed that they auditioned for American Idol unsuccessfully

Two times: Colbie said she auditioned twice for American Idol without success

Idol auditions: Duet guests Bebe Rexha and Colbie Caillat both revealed that they auditioned for American Idol unsuccessfully

Field narrowing: The field was narrowed to the top 14 as five of the remaining dozen contestants from the top 24 were eliminated 

Field narrowing: The field was narrowed to the top 14 as five of the remaining dozen contestants from the top 24 were eliminated 

First through: Mara Justine was the first to advance to the top 14 after her duet with Rachel Platten

First through: Mara Justine was the first to advance to the top 14 after her duet with Rachel Platten

Mara related to the lyrics saying she doesn't 'fit in' and feels 'lost' at school, with Rachel encouraging her to join her in singing alone at the piano to show the 'tenderness and vulnerability' the judges previously sought from her.

'I mean, way to shine at the right time,' Luke told her, while Katy said: 'I thought what we saw tonight was so beautiful. I think Rachel really gave you a gift and that was such a beautiful moment.'

Mara had more tears after the performance, telling Rachel backstage: 'I felt it, and I want to do that for the rest of my life.'

Reworked version: Rachel retooled her hit tune Fight Song to help show Mara's vulnerability

Reworked version: Rachel retooled her hit tune Fight Song to help show Mara's vulnerability

Killed it: Mara backstage told Rachel, 'I felt it, and I want to do that for the rest of my life'

Teen talent: Mara, 15, showed the judges the vulnerability they sought thanks to Rachel's help

Killed it: Mara backstage told Rachel, 'I felt it, and I want to do that for the rest of my life'

'You will,' Rachel smiled.

Jurnee was next to go through after a duet with her idol Lea Michele and her tune Run To You.

Jurnee had admitted she was 'freaking out' at even meeting the star, saying: 'I told myself I'd be cool but I've been obsessed with her forever. I remember watching Glee and being like, "I want to be as hard a worker as Rachel Berry" and I never thought I would get a chance to sing with her. It's dope.'

Awesome journey: Jurnee was 'freaking out' over her duet with her idol Lea Michele

Awesome journey: Jurnee was 'freaking out' over her duet with her idol Lea Michele

But Lea insisted she was the lucky one, telling the judges Jurnee is 'one of the kindest, sweetest people' and adding: 'I just want to be around her, and her talent and her energy. I haven't been so excited to sing this song, like, ever.

'This was a dream come true for me, singing with her.'

Lionel told her: 'Your name is now going to be your title forever because the journey you're taking us on is unbelievable.

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