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The former Friends actress, who is an executive producer on the genealogy programme, has been filming her own appearance, Metro reports.
Kudrow said: "Oh my god, it was good, incredible.
"I just got back from Belarus. I was tracing my family tree and I found out some members of my family were killed in the Holocaust, which was such a terrible shock."
She claimed that the experience changed the way she sees people, adding that it was "pretty affecting" to visit the site where all the Jews of the village were killed.
It was recently reported that Kudrow's former Friends co-star David Schwimmer will appear on the UK version of Who Do You Think You Are?.
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