A source on set told Britain's Daily Express newspaper: "It's almost as
though he's taken on the part of Daniel to help Angelina through it.
"He worries about how much she takes on and tries to do as much as possible
to assist her, in this case almost entering the movie with her."
Brad - who has no acting part in the film - spends hours discussing the
relationship between Daniel and Mariane with Angelina while strumming his
mandolin.
The role of Daniel is actually being played by Dan Futterman, who starred in
'Shooting Fish' and 'The Birdcage'.
Angelina sparked a race row after being cast in the mixed-race role in the
film.
The casting decision has angered black campaign groups who are furious a
white woman has been chosen for the part.
One outraged person wrote on website blacklooks.org: "I had assumed the days
when white actors took on roles of black people had long passed."