The Oscar-winning actress had to lose a lot of weight for a movie role and felt uncomfortable as she prefers being curvier.
Charlize - who also gained over 28lbs to plays murderer Aileen Wuornos in 2003 movie 'Monster' - said: "I played a woman with cancer in 'Sweet November'. I went down to a size 6 and I felt completely uncomfortable. I remember being cold and wrapping my arms around my body and feeling ribs and bone. I felt totally unsexy."
The blonde beauty - who has been dating Irish actor Stuart Townsend for around six years - also took a swipe at Hollywood stars who put partying ahead of their careers.
She added to Britain's Elle magazine: "I don't buy in to all that. Actually, it upsets me the way a lot of so-called celebrities just completely exploit themselves. I don't get it. There's a decorum that I believe just doesn't exist in Hollywood any more. My whole life is about trying to move away from bad things and be happy."
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