Jackson: Testone's 'Idol' Performance 'Unbelievable'

not only got the chance to show off her voice on Wednesday night's live episode of 'American Idol' but her sense of fashion as well after being dressed by celebrity stylist Tommy Hilfiger before her performance.

"I thought she was very layered up and she was, like, hiding her body and I think that sometimes, it's a no-no," Hilfiger said after meeting Testone for the first time.

While Testone told Hilfiger she prefers to rock bell-bottoms, she ended up performing in a flowy, floor-lengthed wine-colored gown with a black vest to cover her shoulders.

But Testone's outfit did not impress judges Randy Jackson, Jennifer Lopez and Steven Tyler hardly as much as her rendition of Billy Joel's "Vienna."

"I'm so happy for you," said Lopez. "It was just such a beautiful thing"

"I really feel like everybody got to see your personality for the first time."

Before her performance, guest coach P.Diddy told Testone to let loose during the show.

"You have a chance to take the mic off and you have a chance to have fun," he said.

In the end, the judge's felt that personality and were impressed by the overall performance. Jackson called Testone's performance "unbelieveable."

"The reason that this girl's in this competition, she is unbelievably talented," he said.

Heading into the performance, Testone was confident that "Vienna" was a good choice for her also.

"I'm 100 percent sure that this is the song I'm supposed to be singing this week," she said.