In September 2003 Munn won a co-starring role opposite Amanda Bynes and Jennie Garth in the second season of The WB sitcom "What I Like About You" as Tina Haven, Holly Tyler's new best friend. Although their characters were the same age, Munn is eleven-and-a-half years older than her co-star Bynes. Munn remained on the show until the show ended with the fourth season on April 24, 2006. Munn also had a recurring role as Caroline, Fez's borderline stalker girlfriend on the Fox sitcom "That '70s Show".