The TV chef, restaurateur and author made the claim at the official launch of the eighth series of the show - the first on Channel 4 - from the HQ of its new home.
“If you’d asked me if I’d seen much of the show, the answer would be no,” she admits.
And the reason?
“Because I really can’t bear to watch myself and I know [new presenter] Sandi [Toksvig] is exactly the same.
“I’m sure Sandi does it because she’s just too busy or hasn’t got time. But I don’t watch myself on television because I’m so bloody vain.
“I can’t bear it. I kept thinking ’why is the camera man going up the back?’”
But after catching a glimpse of the first episode at the press launch, Prue admits she might have has a change of heart.
She says: “Actually for the first time watching it just now, we all went quiet and got completely hooked. So I think I’m going to watch Bake Off (laughs).”
She won’t be the only one.
‘The Great British Bake Off’ airs every Tuesday at 8pm on Channel 4.