Chasing Liberty (2004)

Anna Foster, code-named "Liberty," the daughter of the president of the United States, can't get the Secret Service off her back when she goes on dates with boys. Accompanying her father on a state visit to Prague, she eludes her protectors and meets a handsome British boy, Ben Calder, with whom she embarks on a romantic journey across Europe. But there's something she doesn't know about Ben: He's a Secret Service agent.