The former Friends actress is an executive producer of Who Do You Think You Are? Tonight's episode is sort of a self-portrait with the executive producer taking a film crew to Belarus to find her own roots.
Kudrow said: "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.
If you miss the show on NBC, check later on http://www.hulu.com.