The star is on the brew diet, as his character in the forthcoming film 'Dark Shadows' requires a thin and bony look.
Depp is aiming to get down to 10st so he looks as gaunt as possible, reports the Sun.
'Dark Shadows' is a vampire flick and tells the tale of bloodsucker Barnabas Collins, played by Depp.
The movie is directed by Depp''s friend and frequent collaborator Tim Burton.
Depp is propping up his green tea diet by eating plenty of "low fructose fruit" such as pineapple and strawberries.
