However, while Jamie's great great-grandfather, Alexander Grant, invented the McVitie's digestive biscuit, the reality star didn’t seem to have the same baking skills in his DNA.
The 29-year-old was making banana loaf cake, which was topped with banana halves and decorated with a white and milk chocolate drizzle.
Great British Bake Off judge Prue Leith smiled and asked: “Tell us about your loaf cake.”
Jamie replied: “So today, I’m making a delicious banana loaf cake.
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This is disgraceful!
“My mum used to make it for me as a kid and she would kind of let me lick the bowl.
“It’s kind of this nostalgic thing, so going back to my childhood.”
He then shocked Prue by adding: “I’d never touched flour until Sunday when I tried it for the first time.”
Prue could not believe Jamie and gasped: “And you come from a baking family?”
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Laughing through his embarrassment, Jamie chuckled: “I know! I know!”
Prue then snapped: “This is disgraceful!” as Jamie added: “So I’m a little bit freaking out right now.”
Viewers instantly took to social media following his baking revelation.
One fan tweeted: “Not impressed with Paul and Prue for knocking Sandi's suggestion of giving Jamie a chance at star baker #GBBO.”
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“McVities millionaire Jamie Lang catastrophically fails the #GBBO signature the only way Jamie Laing can,” posted another.
A third added: “Jamie Laing does not deserve to be an heir to the McVities company. He doesn't even know what butter cream is?!
“Like he doesn't even care about cakes & biscuits. You know who does care...me! #GBBO.”
Another teased: “Time to get the McVities out Jamie #gbbo.”
Great Celebrity Bake Off continues next Tuesday on Channel 4 at 8pm.