Bridget Jones is an average woman struggling against expectations. As a New Year's resolution, Bridget decides to take control of her life, starting by keeping a diary in which she will always tell the complete truth. Her charming boss takes an interest in her, and she cannot stop running into a rather disagreeable acquaintance whom Bridget cannot help finding quietly attractive.
On the first day at his new school, Cameron instantly falls for Bianca, the gorgeous girl of his dreams. The only problem is that Bianca is forbidden to date until her ill-tempered, completely un-dateable older sister Kat goes out, too. In an attempt to solve his problem, Cameron singles out the only guy who could possibly be a match for Kat: a mysterious bad boy with a nasty reputation of his own.
Tom, greeting-card writer and hopeless romantic, is caught completely off-guard when his girlfriend, Summer, suddenly dumps him. He reflects on their 500 days together to try to figure out where their love affair went sour, and in doing so, Tom rediscovers his true passions in life.
Mia, an aspiring actress, serves lattes to movie stars in between auditions and Sebastian, a jazz musician, scrapes by playing cocktail party gigs in dingy bars, but as success mounts they are faced with decisions that begin to fray the fragile fabric of their love affair, and the dreams they worked so hard to maintain in each other threaten to rip them apart.