TMZ is reporting that Josh Hartnett, 27, just broke up with Scarlett Johansson, 21. The relatively low key Hollywood couple have lived together in Josh’s Tribeca apartment in NY since December, 2005, and have been dating for just about a year.

Sexy Scarlett Johansson was out and about at Hollywood hot spot Tokio with friends. Noticeably missing — boyfriend Josh Hartnett. Scarlett was low-keying it, partially covering her beautiful face with a hoodie. So, is the relationship kaput? Rumors have it that he called it quits.

It’s surprising that Josh is the one who supposedly broke up with Scarlett. Scarlett was widely quoted two months ago saying that she didn’t believe “human beings are monogamous creatures by nature.”

Hartnett stars in the movie “Lucky Number Slevin” which premiered in NY last night. Lucy Liu, Ben Kingsley, and Bruce Willis are also in the film. Here’s Hartnett at the premiere and after-party last night. (Josh and Scarlet are shown above in a scene from The Black Dahlia, which has yet to be released.)

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