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Katherine "Kat Dennings" Litwack is an American actress who portrays Leah Birch in Big Mouth. She portrays Leah Birch in Big Mouth.

Credits

Character Episode Season Episode No.
Leah Birch Am I Gay? 1 3
Leah Birch Girls Are Horny Too 1 5
Leah Birch The Head Push 1 8
Leah Birch I Survived Jessi's Bat Mitzvah 1 9