Carol Vorderman once "told a nun to f*** off".
The 62-year-old star admitted she was "naughty" at school and by her mid-teens she was already going out clubbing in Manchester.
Speaking on ITV's 'I'm A Celebrity... South Africa', she told campmates Myleene Klass: "Never did my homework. Seriously! Half an hour at the back of the bus, it was all too easy.
"I was always being told off. I told a nun to f*** off once, she was horrible. I was a naughty girl.
"I was in nightclubs in Manchester at 15 with the bad boys. Loved it.”
Meanwhile, she and Myleene have also chatted about their appearances, and the decision to ditch their bathroom scales.
The former 'Countdown' star insisted: "I only go on dress size."
She admitted she threw her scales out "in 1999", adding: "I've not known [my weight] this century."
Myleene revealed: "The second I had daughters, I threw out the scales. No way, I’m not going to have them ruled by numbers. Those numbers.”
She also argued that it's not right to put a focus on children's weight as a way to measure their "value".
She said: "Why would you let your children measure themselves, their value, their contribution by numbers on a scale? I was like, 'No, get rid, I don't want it in the house.' "
Myleene - who has daughters Ava, 15, and Hero, 12, with ex-husband Graham Quinn and three-year-old son Apollo with fiance Simon Motson - insisted "body positivity is so important".
She added: "I want my girls to be empowered by what their abilities are and what they have to say for themselves and how they think.
"I want that to be celebrated, not skin and glands and fat. We all have it.”
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