Actress Katharine McPhee arrived in Los Angeles on Wednesday and debuted her new bob haircut as she walked through LAX Airport, Us Weekly reported.

The short new do is a dramatic change from her long, brunette-colored tresses. With her lighter brown, shorter hair and geek-trendy glasses, the former American Idol alum was barely recognized as she walked through the airport.

The 29-year-old rocked the bob cut with her roots dark brown and the tips of her hair colored warm auburn. She work skinny jeans, denim heels and a gray sweater over a black shirt.

She tweeted a picture on March 25 of her new cut with the caption, "looking purty @KRYSTAR0DRIGUEZ on my birthday...thank you @thegeneralnyc for a lovely dinner!!

The singer is no stranger to rocking different looks. Three years ago, she colored her hair platinum blonde.

"I was feeling rebellious," she told Shape at the time. "That's when I knew I wanted something big. So I said to my stylist, 'Just chop it all off and make me a blonde!' I felt edgy and playful. I went out and bought new clothes for the new me. It was definitely a good thing to do."

On Thursday, McPhee rocked the cut and performed on American Idol with One Republic.

"Hey... Can I just say how excited I am to perform with @OneRepublic tomorrow on idol!?#funtimes," she tweeted.

Fans of McPhee and followers replied and told the singer how excited they were to see her perform on the Idol stage again.

McPhee currenly stars on Smash and The Daily News reported that actress is not happy with the low-ratings that the show received. A source close to McPhee told the publication, "She refuses to do any interviews pertaining to Smash now."