By EMILY SHERIDAN
MAIL ON LINE
PUBLISHED: 04:34 EST, 22 July 2013
UPDATED: 07:27 EST, 22 July 2013
He shifted the pounds to play a prisoner of war in upcoming movie The Railway Man.
However, with filming having long ended, it looks like the slimline Colin Firth may be here to stay.
The Oscar winner, 52, was looking trim as he attended his newest director Woody Allen's jazz band performance on the French Riviera on Sunday.
he actor may like his trimmer fame, or perhaps he is required the keep the weight off for another film.
This year, busy Colin has several films in the pipeline, including Devil's Knot, with Before I Go To Sleep, Genius and the Woody Allen project, which is as yet untitled.
The Railway Man sees Colin play Eric, who was tortured by Japanese Kempeitai military police when he was sent to work on the Death Railway after being captured in Singapore in 1941.