'Chasing Liberty'-type plot formulas

[davver]

'Chasing Liberty' features the rebellious daughter of the President of the USA, who falls in love with a random guy who in the end just happens to be a Secret Service agent hired to protect her. The same thing happens in that recent film with Katie Holmes - was it called 'The First Daughter'? This is a pretty common plot - what other films have it? (PS Can I just make it clear that this is not a complaint - I am more than happy for the like of Holmes and Moore to act in films that require them to look charming, wear bikinis etc all of which they do so effortlessly well.)