Contestant Katrina Darrell Made Headlines

Contestant Katrina Darrell made headlines and became a YouTube star after she showed up for "Idol's" Phoenix, Ariz. auditions wearing an itsy-bitsy bikini and planted a big kiss on host Ryan Seacrest.

Simon Cowell's eyes bugged out as the tanned Darrell flounced into the audition room and launched into warbly rendition of Mariah Carey's"Vision of Love."

And that's when new judge Kara DioGuardi had had enough.

She belted out a few bars herself telling Darrell she had no swing. "Honestly, you don't have the chops to sing that song, sweetie," DioGuardi said.

Not missing a beat, Darrell shot back,"But your demonstration wasn't any better."

Ouch! DioGuardi and Paula Abdul both shot out of their seats and it looked like "Idol's" new judge might get into a serious belting battle with the bikini singer – but the ever-nurturing Abdul stepped in.

Despite Abdul and DioGuardi's calling her singing "terrible," Darrell made it through to Hollywood – so we might still see that showdown.

New 'American Idol' judge Kara DioGuardi

Kara DioGuardi joins the ranks of Randy, Paula and Simon as the fourth 'American Idol' judge.

A singer/songwriter plucked out of semi-obscurity by "American Idol" producers to shake up the judging panel on the hit show, Kara DioGuardi she sometimes intentionally goes up against Simon Cowell to keep contestants in the competition.

DioGuardi said she's more lenient than Cowell at giving second chances in auditions. Often, she told reporters yesterday, she knew Cowell would cut someone in whom she saw potential, and she voted against him, saving the contestant for another day.