Keith was filming X Factor winner Sam's home for ITV2 show Through The Keyhole when he commented on the fact she hasn't swapped it for a bigger place now she's famous.
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When he arrived at Sam's street, Keith said: "It looks like I'm on the set of Brookside."
After entering the house and looking around all of the rooms, he remarked: "Ok, let's go somewhere else. Oh, we've done everywhere haven't we?"
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The panel on the show managed to guess it was Sam's home, thanks to her Leicester City signed football shirt and her Sharon Osbourne book.
Sam then appeared on the show, and Keith said to her: "It's a lovely, humble, little house. Has your cheque not come through yet then?"
But Sam defended herself, replying: "It's tiny. I'm not moving though. When I won the show, I thought I'm not going to buy anything massive, I'm just going to extend what I've already got – I love where I live.
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"My kids go to school there, so I don't want to change anything."
Her humble response received a round of applause from the studio audience, the celebrity panel and even Keith.