The Heir and the Spare — Emily Albright

Going all the way to England for college--to Oxford, no less--for college would be exciting enough. But no sooner does Evie set foot on English soil than she falls for a boy who turns out to be a real prince--in fact, second in line to the throne of England. Edmund is wonderful, even though loving him can be a royal pain, from the demands of his family to the stuck-up aristocrat who thinks she should be the one to win Edmund's heart. All that is swept aside, however, when the riddle of Evie's past surfaces, and the new couple becomes obsessed with figuring out who the real Evie is, with the growing suspicion that the truth will be a shocker.