‘HANNAH MONTANA’ STAR ARRESTED FOR DUI

Mitchel Musso -- the Disney star who played Oliver Oken on "Hannah Montana" -- was arrested for drunk driving in Burbank, CA yesterday ... TMZ has learned.

Law enforcement sources tell us ... 20-year-old Musso was pulled over at 3:43 AM Sunday ... after he failed to slow down for cops who were directing traffic for an unrelated accident.