There’s going to be a “Party in the U.S.A.” — or at least in Hollywood — when Miley Cyrus lends her musical expertise to the remaining contestants on American Idol this week.

FOX confirms that the teen pop sensation will be the celebrity mentor during the Billboard No.1 hits-themed show on Tuesday (8 p.m. EST). Of the 11 contestants left, three are teens: Siobhan Magnus, 19, and Aaron Kelly, 16, and Katie Stevens, 17. Tim Urban is 20 years old.

But last week’s theme — contestants performed from The Rolling Stones‘ song book — proved age is nothing but a number as Magnus, Kelly and Stevens all pleased the judges with their take on classic songs by the legendary rock band.

On Wednesday’s results show (9 p.m. EST), Miley will be back to perform her hit song, “When I Look At You,” and new couple Joe Jonas and Demi Lovato will sing their duet, “Make A Wave.”

Source, Fame Pictures

Due to medical issues, American Idol Top 20 contestant Crystal Bowersox is unable to perform on Tuesday’s show, Fox confirms to UsMagazine.com in a statement.

As a result, the guys will compete on Tuesday night’s show, and the women — originally slated to take the stage Tuesday — will perform Wednesday.

A source tells Us that Bowersox, 24, is recovering from diabetes complications.

“Crystal is doing OK and should be fine for tomorrow,” the source says of the Ohio-based soul-rocker mom.

On Thursday, two guys and two girls will be cut from the competition. Season 8 finalist Danny Gokey will also perform his new single, “My Best Days Are Ahead of Me.”

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While we were shocked when Simon Cowell announced his ‘American Idol’ departure, we were not prepared for Howard Stern to throw his hat in the ring to be considered for Cowell’s old gig. At first, we thought Stern might be joking about his ‘Idol’ interest, but after bringing it up on his show two days in a row, it’s time to consider the pros and cons of a Stern/’Idol’ pairing. Entertainment Weekly Senior Writer and resident ‘Idol’ expert Michael Slezak likens Stern on ‘Idol’ to combining chocolate with cheeseburgers. “They’re two great tastes,” Slezak tells PopEater. “But I don’t necessarily know you’d want them together. They’re very popular, but I think there’s a reason McDonald’s has never offered a chocolate-dipped cheeseburger. I think Howard Stern and ‘American Idol’ are pretty much a chocolate cheeseburger.” Can America handle a chocolate, Stern/’Idol’ cheeseburger?

But wait…there’s more!

What do you think of Howard Stern replacing Simon Cowell? I’m a huge Howard fan, and to be honest – I think I would like it. I like Howard’s honesty.

Katy Perry had so much fun as a bitchy guest judge on American Idol that she would quit her music career to take the job full-time.

The singer reportedly filmed her stint as a guest judge on the singing contest last year, following the departure of Paula Abdul. Her appearance aired on Tuesday night.

And, though she and regular judge Kara DioGuardi appeared to dislike one another, Perry isn’t about to let a clash of songwriters get in the way of her Idol ambition.

Now that music mogul Simon Cowell has announced he’s planning to leave the show when his current contract expires in May, the pop star wants to fill his seat.

She says, “The American Idol experience was awesome. If I was offered that job as a permanent host, I would ditch my career and take on that career.”

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In an appearance taped for an episode of The Oprah Winfrey Show set to air Tuesday, Adam Lambert spoke about the week’s big American Idol news — Simon Cowell’s announcement that this season, which kicked off Tuesday, will be his last.

“The audience will definitely miss Simon,” Lambert, 27, says. “The contestants will miss out on, like, really honest criticism. Sometimes it can be a little personal, and I know other contestants took it to heart sometimes and got really stressed out about what he would say. [But] I think that that’s important to making you a better performer … You’ve got to hear the good and the bad.”

But American Idol can survive without Cowell, according to Lambert, because the show isn’t about the cheeky British judge. “Ultimately, after the first couple weeks of auditions, the audience tunes in every week for the contestants,” says Lambert, who performs his current song, “Whataya Want From Me,” on Oprah. “[Audiences] grow fond of one or a couple of the people and they get behind them and they’re invested in them. And of course it’s great to hear … what’s Simon going to say. But we tune in to hear the contestants blossom or not.”

Source, Bauer-Griffin

Simon Cowell says he will instead serve as executive producer and judge on the American version of his hit UK show “The X-Factor,” which will begin filming in 2011. The show will run on the Fox Network.

“I’m thrilled that we have put a date on the launch of the U.S. version of ‘The X Factor’ and delighted to be continuing to work with Fox,” Cowell said via statement. “We have a fantastic relationship, a great team and are all very excited about this.

“We have had a very successful relationship with Simon Cowell for many years,” Mike Darnell, President of Alternative Entertainment, Fox Broadcasting Company, said. “And we’re absolutely delighted to continue our relationship with him. ‘The X Factor’ has been a massive success around the world, and we can’t wait to bring it to the U.S. in 2011.’”

“There’s been a lot of speculation partly because we didn’t have an agreement. We reached an agreement at half past 10 this morning. Where we have come to is ‘X Factor’ will launch in 2011 with me judging and producing the show. So this will be my last season on ‘American Idol,’” Cowell said at a press event in Los Angeles Monday, Deadline.com reported.

The announcement comes a day before the ratings juggernaut begins its ninth season. Talk show host and comedian Ellen DeGeneres will debut Tuesday as the fourth judge, replacing Paula Abdul. Producer Kara DioGuardi joined the judging panel last season to mixed reviews. There’s More!

American Idol isn’t the same without Paula Abdul, says Simon Cowell.

On the Fox show’s upcoming ninth season, judges Randy Jackson and Kara DioGuardi return – along with celeb guest judges, including Victoria Beckham, Shania Twain and Katy Perry.

Cowell, 49, tells Extra the show is now “different. It’s like comparing a carrot to a banana.”

Though the judge says he doesn’t want to “get in the middle” of Idol execs and Abdul, 47, he says, “I miss her.”

He adds that Abdul – who denied to TV Guide that she left the show over money – is “someone who will always work.”

So what’s next for Abdul?

“I definitely want to do a talk show because it would be different,” says Abdul, who has shot a guest role on Lifetime’s Drop Dead Diva and will host VH1′s Divas Live Sept. 17. “It would be a lot of fun variety with a ton of unexpected stuff and tributes to everyday people getting their big chance.”

Source, Bauer-Griffin