"Richie Sambora has entered an undisclosed treatment facility in Los Angeles," the rep said in a statement. "He asks that you respect he and his family's privacy at this time."

The specific nature of Sambora's substance-abuse problem was not disclosed. [but according to Perez Hilton, Richie was "blitzed" during the taping of the Bon Jovi Unplugged episode on Tuesday. Maybe he was trying to keep up with Jon's new country direction?] - more on this story