Helena Bonham Carter refused the offer of a fat suit to play the Queen Mother in The King's Speech, so that she could indulge in marshmallows.
The svelte star, who wears unfitted dresses to play the late wife of King George VI in the award-nominated film, was delighted at not having to stick to a strict Hollywood diet.
Helena told Total Film magazine: "At one point [director Tom Hooper] said 'Shall we put you in a fat suit?'. I said 'Noooooo! I looked as if I was in one anyway but that's just me... I did feel like I could eat quite a lot.
"I didn't have to go on the actresses' diet of eating nothing. I was eating a lot of marshmallows on film."
The 44-year-old actress, who stars alongside Colin Firth, said she hoped she didn't look too much like the Queen Mother we all remember.
She said: "I don't know if I really carried it off.
"We all know her when she was in her nineties and obviously I don't look like her. I hope. Not in a disrespectful way, I mean her later years..."
The Kings Speech is released on January 7.