Kristen Bell wished her friend a very happy birthday with a bikini selfie which none of her fans were expecting. The Frozen star, 40, shared a snapshot alongside the birthday girl but they weren't sunning themselves on a beach in a tropical location… they were sitting on a bus. MORE: Kristen Bell sparks huge reaction with choppy bangs and glasses Kristen and stylist, Nicole Chavez, looked to be on an adventure in a foreign country and appeared makeup-free and a little hot and bothered. WATCH: