
The adverts will show the singer pick up the bar during a gap in recording at the BBC's Maida Vale studios - then break into a rendition of the theme: "Only the crumbliest, flakiest chocolate tastes like chocolate never tasted before."
She is the first celebrity to appear in the traditionally raunchy adverts, which have been on television for 40 years and previously featured models in the bath and their underwear.
Stone explained: "It's OK to be sexual, but I just don't want to do that. My mum came with me to meet the guys at Cadbury. She was like, 'It's not going to be, you know, the sex thing that they do.' I was like, 'Mum, oh my God, sharrup!'
"They said no, it's a whole new take on it. It's just normal and chill with me wearing normal clothes. Many women in the public eye want to [promote] things like slimming pills and how to have bigger breasts.
"But I thought, maybe I could promote chocolate, 'cos it tastes good. People need to stop worrying about being skinny and things like that."
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