Kate Bosworth displayed a band on her left ring finger as she left a spa in LA on Friday. On Saturday, Kate got cozy with her fiancé, Michael Polish, at a special music event. Kate and Michael attended Interpol singer Paul Banks's discussion for his new solo record, Julian Plenti Lives. Michael also wore jewelry, donning what looked like a wedding band. Kate let it slip that she was engaged when she referred to Michael as her fiancé in an article she contributed to August's Vogue. They've been dating for around a year after meeting on the set of Big Sur, which Kate starred in and Michael directed.