Kristen Stewart turns 20 today and while she's rumored to be in Budapest visiting Robert Pattinson where he's filming Bel Ami, we're celebrating as well! Kristen has been in the film business for more than a decade so we're taking a look at her amazing career. From the Panic Room debut to her relationship with Robert Pattinson — check out these great photos of Kristen with friends and having fun through the years! Plus, PopSugar UK has a quiz of your Kristen trivia and FabUK is testing your style knowledge. Click through to see our favorite Kristen highlights!