In her application to Lord Alan Sugar, Luisa, 25, had said: "People look at me and assume I'm a bimbo with hair extensions, fake boobs and nails."
Margaret, however, seems unimpressed by the declaration while going through her application, especially when Luisa tells her: "That comment was very tongue in cheek."
She tells the cupcakery owner: "Do you think it's sensible to put tongue in cheek comments when completing an application form with the view to someone making a quarter of a million pound investment?"
Margaret also remarks on Luisa's statement that she has "a brain like Einstein". She tells the mum-of-one: "The lady with a brain like Einstein, and who got a C, D and E in her AS Levels."
Trying to laugh it off, Luisa quickly replies: "Yes, I flunked my AS Levels..." Ouch!
Watch a full preview clip of Luisa's interview with Margaret below!
The Apprentice, 9pm, BBC1, Wednesday 10 July.
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