Christian Bale Walks a Thin Line

The 35-year-old -- who famously dropped 63 lbs for his role in "The Machinist" and then quickly bulked up for "Batman Begins" -- was spotted in Boston on Monday, once again working the heroin chic gaunt look to play drug addicted boxer Dicky Eklund in his latest film.

Hopefully an apple a day keeps the cinematographer away ... from walking into his scene.