The actor was attending a photocall in Paris as part of his tour around the world promoting the film, in which he stars as a man who ages backwards.
The actor made the unfortunate wardrobe mishap while posing for photographers in Paris, reports the Daily Telegraph.
As Brad stood looking smooth and relaxed in front of the press, he was unaware that he was revealing more than he had bargained for.
The 45-year-old has received an Oscar nomination for Best Actor in his new flick.
He will be up against Mickey Rourke (The Wrestler), Richard Jenkins (The Visitor) Frank Langella (Frost/Nixon) and Sean Penn (Milk) for Best Actor.
