Have you ever wondered what it would be like to be the younger sibling of a world famous superstar? Well, your fantasy is Kaitlyn Bieber's reality. Kaitlyn Bieber is Justin Bieber's little sister. Want to know the details? Read on to learn about Kaitlyn Bieber & her life as Justin Bieber's little sister. (COMPLETED) (I wrote this when I was 13. You have been warned.)