The Labour former deputy leader said the reality TV star is "brave and pioneering" after being asked about her sharing naked pictures of herself to support feminism.
The thing about Page 3 girls in the Sun is it was male editors producing young girls for the male readers as fodder
"I am an expert on the Kardashians, I have to confess," Ms Harman told ITV's Good Morning Britain during a debate about the EU.
"I think, if you step back, the overall message that comes out of the Kardashian women is that they are kind of going to make their own decisions, make their own way in the world, they're not going to be told by anybody what to do.
"They are going to try things differently. If they make mistakes, well, they'll get up back and try and do it differently.
Kim Kardashian takes a pregnancy test on an aeroplane
"There's a kind of bravery and pioneering spirit in them."
When asked why she had campaigned to have topless pictures on Page 3 of the Sun scrapped, she replied: "I think it's an issue of control actually, because I get the sense from the Kardashians that they are in control of their own agenda.
"The thing about Page 3 girls in the Sun is it was male editors producing young girls for the male readers as fodder."