Katie Elizabeth Walder (born October 13, 1982) is an American actress who plays Shannon, Barney's first girlfriend, on How I Met Your Mother.


Katie Walder is the youngest of five children - two brothers and two sisters. She started acting at a young age in musicals and plays in school and did some print work as a young teen in such magazines as Teen and YM. She went on to study theatre in college and had every intention of going to Yale Grad for acting, but landed a professional acting gig on All My Children (1970), and continued to work in New York City in theatre with notable Broadway directors such as Michael Grief, Keith Reddin and Daniel Aukin. Katie soon moved to Los Angeles and quickly landed her recurring role on Gilmore Girls (2000).

Since then she has appeared in over 20 television shows, including New Girl, The New Adventures of Old Christine, The Good Wife, and Rules of Engagement, as well as the award-winning independent film, Shelter.

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