American Idol fans rip Katy Perry's 'unflattering' finale look as they ...

AMERICAN Idol fans have bashed Katy Perry's finale ensemble, claiming it appeared as though she was wearing a swimsuit.

The star kicked it up a notch with a sexy ensemble but fans didn't find it so flattering.

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The pop singer took the stage alongside Lionel Richie and Luke Bryan wearing a red dress with cutout details and a sheer skirt.

The top portion of the dress stretched across her collarbone with a cutout underneath and another below her chest.

The bottom portion of the dress featured an underwear-style red piece and a long skirt that was entirely see-through and had shiny rhinestones all over it.

She paired the ensemble with a sexy pair of high-heeled boots.

Katy, 38, wore her hair down in large bouncy curls.

Fans weren't feeling the look and took to Twitter to make it known.

One Twitter user wrote simply: "That dress is not flattering on Katy Perry!"

Another tweeted: "Is she at a swim meet?"

Katy was unphased by the comments about her outfit during the American Idol finale – partially because she was too busy crying over the contestants' final performances.

Iam Tongi performed early in the night, delivering a heartfelt rendition of Keith Urban's song Making Memories of Us.

Before taking the American Idol stage, Iam met with Keith to chat about his song choice and get some pointers ahead of his performance.

He revealed early on in their discussion that his late father used to play one of the Australian country singer's songs in their home when he was a kid.

Keith noted his "emotional connection" to the song, suggesting that it was the right choice for him.

Iam took the stage with his guitar strapped on and flip-flops on his feet.

He delivered a characteristically moving performance that left more than a few of the judges emotional.

Katy Perry was seen crying in her seat while Lionel Richie and Luke Bryan hid their feelings a little better.

After Iam was done singing, Katy opened the judging with this: “Can I just say one thing? 

"In between you and Megan [Danielle] I had to grab a little tissue and fold it into a triangle because every time you come on and you sing the vibration that comes out of your mouth, it goes through the weeds of people’s hearts and it just gets to them."

She concluded: "It moves us so much. So when you sing, I am ready to feel, baby.”

Luke and Lionel both revealed in their judges statements that they, too, had been in or near tears during the performance.

Katy and Luke again broke down as he took the stage for a second time on Sunday.

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