Hilary and Haylie Duff are sisters slash gym buddies! The two Hollywood starlets - one more famous than the other - penciled in a workout together this afternoon and left looking all buff and muscled-up. And wearing matching black tanks (and shades), no less! Two cute.

Rachel Uchitel's involvement with Celebrity Rehab is causing plenty of drama. Tiger's alleged mistress has checked in ... then out ... and now back in again to Dr. Drew's facility. Now Michael Lohan is saying her involvement with the show is his doing ... and he wants to make sure he gets paid for it.

Lohan claims that he introduced Rachel to her manager, David Weintraub, months ago. At the time of the meeting, Lohan says Weintraub agreed to pay him 25% of whatever projects Rachel takes on.

According to Lohan, Uchitel is earning $500,000 to appear on Celebrity Rehab 4 with Dr. Drew ... and he wants his 25%. However, Lohan says that Weintraub has been ignoring calls from Lohan's attorney Lisa Bloom in the hopes of avoiding any payment.

As for Rachel Uchitel appearing on Lohan's upcoming web show Celebrity House NY, he says she'll make an appearance towards the end of the season.

Reps for VH1's Celebrity Rehab have not been available for comment.

Jersey Shore - MTV Shows

That's right, the MTV overnight hit returns tomorrow night and like the rest of reality-obsessed America, we're dying to see what Snooki and co. have in store for us this time around... check out the GTL-loving cast in a special sneak peek above!

So much for those turquoise and purple man panties we got a peek at yesterday afternoon!

Today we snapped Russell Brand on the set of Arthur in NYC, and he was still making all sorts of goofy faces at photographers, but the British comedian grabbed a stretched out tank and some sweats to cover himself up. Hmm, not sure if that's a good thing or a bad thing?

I'm sure Sarah Palin just loooooves this! Father of the year? I think so!

Sidebar, who thinks a Levi/Bristol reality show will be announced any day now?

The world's most famous socialite has another album coming out and pop star Kylie Minogue was her inspiration.

"I really have always loved Kylie Minogue - She's, like, one of my favorite artists. I've just been really inspired by her. I just wanted my music to kind of... emulate her," Paris Hilton tells Heat magazine.

Imitation is the sincerest form of flattery! And who better to look up to than Kylie? She's an icon!

Paris' album will be "like dance, club music" she says. Can't wait!

Since sailing is a huge part of Zac Efron's new movie Charlie St. Cloud, we knew there were going to be plenty of sexy shirtless shots of the 24-year-old hunk in and out of the water!

We got some clips of Zac shooting some scenes in a tank, and we're ab-solutely loving it! The movie opens in two days, and we're definitely excited to see Zac take on a more mature role.

Best idea ever! Although they should've put Jess on to replace Paula way back when.

Jessica Simpson has met with Simon Fuller several times and is in negotiations to become an American Idol judge, reports Life & Style.

"They like her. She's a good fit - and she likes it," claims an insider, but the singer won't be replacing Simon Cowell. "They're two entirely different personalities. This is part of a massive overhaul of the show. There may be more judges, more opinions."

Simpson's rep tells X17online that nothing has been confirmed at this time, but she also didn't deny that Jess is in negotiations.

Meanwhile, Simpson's dad Joe would reportedly love to see his daughter on the hit show. Would you?