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Munn was born in Columbia, South Carolina, the daughter of Russell and Nadine Munn. Her mother, an elementary school teacher, encouraged her daughter in the arts by letting her take dance and singing lessons at an early age. Munn graduated from
AC Flora High School and The College of Charleston. From there, she moved to New York, where she won a role in the Off-Broadway classic,
The Fantasticks.Munn's further
auditions led to small roles in
Hollywood productions; most notably in
White Oleander alongside Michelle Pfeiffer and in
Elizabethtown, directed by Cameron Crowe.Her biggest break came in 2002 when she got a co-starring role, opposite Amanda Bynes and Jennie Garth, on the sitcom
What I Like About You, as one of Holly's best friends, Tina. She also has a level of notoriety for a recurring role as Crazy Caroline, Fez's borderline stalker girlfriend on
That '70s Show.Munn currently appeared in the ABC comedy series
Carpoolers.