File this one under ‘what the heck is she doing with him’ file. The National Enquirer says that Mary-Kate Olsen cheated on her boyfriend Nate Lowman with tubby Jonah Hill. The unlikely pair hook-up at Chatuea Marmont August 26.

“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.”

I don’t like this at all. Not that I really care who Trollson is doing the dirty with, but the mental image I get of tubby, sweating Jonah laying all up on little tiny MK is very disturbing.

mary kate and jonah