HOLLYWOOD, Calif. — Katherine Heigl and Gerard Butler were among hundreds forced to evacuate the Four Seasons Hotel in Los Angeles on Saturday afternoon due to a bomb scare.

The two stars were on-site to promote their new film, "The Ugly Truth," when the hotel's fire alarm sounded at 1:45 p.m., prompting the evacuation of nearly 400 guests and hotel employees.

Heigl and Butler mingled with the crowd and fans on Burton Way before they ventured over to the nearby Il Cielo restaurant.

Also forced to evacuate was the AC Milan soccer team, was staying at the hotel in preparation for their Saturday night game against the Los Angeles Galaxy.

A police sweep of the property turned up nothing suspicious and guests were allowed back into their rooms within a few hours.

Also see: "The Ugly Truth" premiere red carpet gallery