I need to know the name of this movie!

I once saw a trailer, it was about a young average American girl falling in love with a movie star (or maybe just going on a date with him) and by the end of the trailer, it looked like maybe he'd fallen in love with her? I have no idea who the star was, just a young attractive actor. It was all about young love, though. Wanna see it, but have no clue now what it is....

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