She's played by several actresses across different movies and TV series:
* Suzanna "Zuzanna" Szadkowski played Kitty in the 1989 film "X-Men: The Animated Series"
* Katie Stuart played Kitty in the 2000 film "X-Men"
* Ellen Page played Kitty in the movies:
* "X2: X-Men United" (2003)
* "X-Men: The Last Stand" (2006)
* Anna Paquin played Kitty in the movie "X-Men: Days of Future Past" (2014) and the short film "X-Men: Apocalypse: The Making of a Scene" (2016)
* Charlie Heaton plays a young Kitty in the "X-Men: Apocalypse" (2016)
* Haley Ramm voices Kitty in the 2009-2014 animated series "Wolverine and the X-Men"
Are you asking about a specific Kitty character from a certain film or TV series? If you tell me more about what you're looking for, I can give you a more specific answer!