Kristen Stewart has appeared on the big screen since she was ten, but you probably know her, love her, and -- okay, are just a teensy bit jealous of her -- as Bella Swan in The Twilight Saga! Compared to her eternally 18-year-old character, this actress is way over the hill. Today, Kristen celebrates her 20th bday. Happy birthday, Kristen!

Fun Facts About Kristen:
-Kristen tells J-14 that she's a music fanatic -- when it comes to listening and playing! "I really love playing guitar," she says.
-The star was super influenced by her latest flick The Runaways. She even tells us that her "(s)hero" is the real-life rocker she played, Joan Jett!
-A naturally green-eyed gal, Kristen wears brown contacts to play Bella!

Leave your birthday wishes for Kristen below!