From what I recall, the movie is about a younger and older sister (cousin? bff?) with her boyfriend who are traveling abroad in Greece (or some similar looking area, very sunny, white stone homes).  The younger sister is coming of age and develops a crush on her other girl’s boyfriend.  The movie was in English but the actors were not American all had accents.  It’s light, not too dramatic or romantic.

There are only three scenes that I have a hazy memory of; the younger sister drinks and dances with a boy in a restaurant; the three (girls and boyfriend) are at a festival late in the evening, the younger sister tells her sister’s boyfriend (or he simply realizes that she’s in love with him) but he treats her like a kid sister so she storms off somewhere; I think she meets another boy; the very end…suddenly the older girl and boyfriend break into a music video-like song on the bus out of town.  I STILL hum that song but I can’t remember the words!

Hope that rings a bell for someone!