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Kristen Johnston
Kristen Johnston
Role Tammy Diffendorf
Season(s) S5 - S6 - S7 - S8
 
Date of Birth September 20, 1967 (age 57)
 
Origin Washington, D.C., USA
 
IMDb profile

Kristen Angela Johnston (born September 20, 1967) is an American actress. She portrays Tammy Diffendorf in the CBS sitcom Mom.

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