This Hawaii native moved to Nevada where she spent most of her early years. She then decided to make her way to L.A. to study her life passion, dance. Her dancing soon led to commercial work and appearances in music videos for Cher, Korn and Mick Jagger. Sossamon was discovered while attending a birthday party for Gwyneth Paltrow, where a friend of Shannyn's was deejaying. There the director of A Knight's Tale (2001) spotted her in the crowd and asked her to audition. She did and landed the starring role of Jocelyn opposite Heath Ledger.