filed under: Mary-Kate Olsen

Mary-Kate Olsen is two-timing her boyfriend with a surprising new guy - chubby “Knocked Up” star Jonah Hill, the Enquirer has learned exclusively. The unlikely couple cozied up to one another at Los Angeles’ Chateau Marmont hotel on Aug. 26 - just one night after the stick-thing actress stepped out to a rock concert with steady beau Nate Lowman.

“It was a shock to see Mary-Kate together with, of all people, geeky Jonah,” an eyewitness told The Enquirer. “They were on a double date with another couple, dining at the hotel around 10 p.m. Mary-Kate and Jonah sat close together and seemed totally into each other. They were both wearing plaid shirts that almost matched. It was the cutest thing.”

“From what I saw at the Chateau Marmont,” said another source, “Mary-Kate had forgotten about Nate and seemed totally enamored of Jonah. And he couldn’t keep his eyes off her, either.”

Not even exceptionally well-off former child stars are immune from economic tough times.

News is trickling out that Mary-Kate Olsen, (who, according to Forbes, splits an estimated $40 million annual income with her sister Ashley) is “burning through her money,” says Us Weekly.

The magazine says that M-K has been advised to cut down on “travel, jewelry, clothes and especially security.”

That said, the magazine also includes the counter-opinion of an insider who claims things are fine. “She has been focusing so much on her career and business, there hasn’t been time to spend a lot of money,” the source says.

"She was completely in charge," the actor, 64, tells PEOPLE of their enthusiastic make-out scene in a telephone booth.

The former star of Gandhi and Schindler's List – who's currently shooting with Martin Scorcese in Boston – drove down to New York for the movie's Cinema Society and Sony Cierge-sponsored party at the Gramercy Roof Club.

"I love watching the movie," his wife, Daniela, said of the coming-of-age stoner film. As for her real-life leading man, she added, "I love him. He's amazing."

"Colin was clearly taken with Mary-Kate and snuggled up to her on the couch at the bar. I'm not sure if the feelings were mutual, though!"

"They were super into each other,” clubgoer Susan McGinley tells Life & Style. Adds a second partyer [sic], Stacey Kives, “He was making moves and she was eating it up.”

The duo kissed passionately for a few minutes, says the first witness - and then Mary-Kate, 21, put her hand over her mouth and giggled.

One person wasn’t laughing. When Stavros’ on-again, off-again love Paris Hilton, 26, heard about the PDA, she was infuriated. “She thinks MK was publicly hooking up with Stavros just to piss her off,” says an insider close to Paris.

The actress entered the emergency room of a New York hospital on Monday.

"Mary Kate got a kidney infection," says rep Nicole Caruso. "She's resting comfortably and will be released in the next day or so."

The actress, who turned 21 in June, recently said she was in good health.

"Mentally, physically, I feel pretty on top of my game right now," she told EW.com in September, as she prepared for her debut in Showtime's Weeds. "Talk to me next week, I don't know. Today, I feel good."

"I run around my house naked with heels all the time. It's so funny. All my friends will tell you I love running around in kimonos and jewelry or naked with jewelry."

GET ready to cringe during Sir Ben Kingsley's new movie, "The Wackness," in which the Oscar-winner, 63, passionately locks lips with tiny Mary-Kate Olsen, 21. Currently shooting in New York, the film directed by Jonathan Levine is about a drug dealer who trades marijuana for therapy sessions with his shrink, played by Kingsley. Insiders say the steamy scene with Olsen - described as a "full on make-out session" - was shot at a Greenpoint watering hole.

Introducing the new Bond Girls: Mary Kate and Ashley Olsen! One of the producers (who happens to be a female) of Daniel Craig’s next James Bond movie is very impressed with Ashley and Mary-Kate and really wants them in the 22nd 007 movie scheduled to start filming in 2008. The Olsens would be the first set of Bond twins. The producer is making the offer as appealing to the girls as possible - there will be no nudity or sex scenes. And the twins will play good girls - not villains. (ER’s Goran Visnjic is set to play a villain) The Olsens are seriously considering the offer.

"Ashley has always thought her nose was a little too big, so she wanted to get it done. When she talked to her sister about it, she loved the idea. They both love changing their looks. They thought this would make them look more polished."