Easy A (2010)
Chosen by me because I like to go to the cinema a lot.
A generally smart and funny teen comedy that wants a little too hard to be Mean Girls (Emma Stone even looks like Lohan here) but whose secondary cast of characters aren't as strong.
Like Shane Black's rather brilliant Kiss Kiss Bang Bang this film often falls back onto highlighting it's cliches by announcing loudly 'see just like the movies' which doesn't really excuse hackneyed storytelling but also like that film has snappy one liners to cover it all up so it never really matters.
It can't quite wrap it all up plausibly, the end seems to come from nowhere (why should someone who has lied non-stop through the film and says so be believed just because she made a vlog) but since the whole thing covers school life with as much veracity as the average episode of Glee I guess this is not a huge problem.