Charlize Theron claims 'I'm very fat' after 30lbs weight gain

Oscar winner has piled on the pounds for film role

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USA-AMFAR/GALA

Weight gain is normally frowned upon in Hollywood with leading ladies often going to extreme lengths to stay slim.

So it was a surprise to hear Charlize Theron openly talking about her expanding waistline at a recent showbiz event.

The Oscar winner, 41, labelled herself "very fat" after gaining 30lbs in recent months.

amfAR's Inspiration Gala Los Angeles - Arrivals

The South African actress, who started out as a model, covered up her fuller figure in a black, loose-fitting dress as she attended the amfAR Inspiration Gala in Los Angeles.

Taking to the stage at the star-studded event on Thursday, Charlize conceded: "Yes, I am very fat right now."

Charlize has gained weight for her role as a mother-of-three in upcoming film Tully, due for release next year.

It's not the first time the actress has changed herself physically for a role - she previously gained 30lbs to star in her Oscar-winning role in Monster and shaved her head for 2015 blockbuster Mad Max: Fury Road.