She looks like the grandma who has to cook for everyone, but Mary Berry, star of “The Great British Bake Off,” has a dark past.

Berry recently recounted the time that airport security detained her for taking bags of powder through airport security, Metro reported.

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Berry told Graham Norton, “I was arrested 25 years ago. I was going to the US to do some cookery demonstrations and was worried that there might be problems so I weighed out all the ingredients - flour, sugar - and put them all in little plastic bags.”

You can imagine what came next.

The K-9's zeroed in on her bags, Independent reported.

“Suddenly I was surrounded by uniformed people and my assistant and I were put in separate cells. It was alarming. When I was asked if I was going to make money from the stuff, I said, ‘I do and my fee has already been agreed,’” Berry told Norton.

Berry was on "The Graham Norton Show" to promote her new BBC series, "Britain's Best Home Cook."