LOS ANGELES -- Actor Josh Hartnett has been hospitalized for abdominal pains, according to his publicist.

The 30 year old actor was taken to Cedars Sinai Medical Center by ambulance around 1:45 a.m. Monday morning according to publicist Susan Patricola. He had been staying at the Chateau Marmont Hotel in West Hollywood.

Harnett is "under observation but is resting comfortably," according to Patricola.

Patricola says Hartnett had a flare-up of a gastrointestinal issue that affected him while he was starring in an onstage production of "Rain Man" in London last year.

Hartnett has appeared in several films including "Pearl Harbor," "Black Hawk Down," "Sin
City," "40 Days and 40 Nights" and "The Black Dahlia."