Keira was born on the 26th of March 1985, in Teddington. At the age of three she was already interested in acting because her parents were actors.
She went to an ordinary state school in Teddington, where they discovered she had difficulties in reading and writing. With the help of her parents she worked very hard untill she overcame her problems. Her parents allowed her to play in films only if it did not interfere with her school education.