The 21-year-old actress was faced with having to saddle up on the set of new movie `Snow White and the Huntsman` - in which she plays the titular beauty - and she admits she struggled to face up to the task because she once "fell off" a horse and broke a bone.
According to the Daily Star newspaper, she said: "I was shaking like a leaf when saddling up. Ridinghorses terrifies me. I`ve felt that way ever since I fell off a horse when I was nine and broke my elbow."
It is not the first time Kristen - who is dating her `Twilight` co-star Robert Pattinson - has confessed to being nervous about something she has had to do for a film role.
The star had to learn how to strip for movie `Welcome to the Rileys`, but found much of the preparation she did went unused.
She said: "You don`t actually see me strip which I suppose is a good thing as I was initially nervous about that. Now it`s kind of annoying because I learned how to do it but you don`t see any of it. But it`s probably for the best."