Bridget Jones, played by Renée Zellweger, finds herself in a frustrating predicament. Now in her early thirties, she's still single, accident-prone, and grappling with concerns about her weight. Employed in publicity at a London book publishing house, her primary distraction is daydreaming about her charming yet unreliable boss, Daniel Cleaver (Hugh Grant).
At a New Year's party hosted by her parents, Bridget unexpectedly reconnects with Mark Darcy, portrayed by Colin Firth, the son of family friends. Their childhood acquaintance quickly turns awkward; Mark perceives Bridget as foolish, while she finds him haughty and rude, particularly when he sports a rather unfortunate reindeer jumper. Unbeknownst to Bridget, Mark privately complains to his mother about being set up with "a verbally incontinent spinster who smokes like a chimney, drinks like a fish, and dresses like her mother."
After an eventful day rife with blunders—losing her purse, shattering her coffee mug, and becoming trapped in an elevator—Bridget's woes escalate when her shopping bags burst, causing her to lose her temper over the curtains falling from their rail. Amidst the turmoil, upon catching a glimpse of her less-than-ideal reflection, she resolves to transform her life. Thus, she begins chronicling her journey in a diary, documenting her aspirations to quit smoking, reduce her drinking, shed some pounds, and find her dream partner.
As Bridget and Daniel engage in flirtatious banter at work, primarily through emails, a romance blossoms after a book launch, even as she is fully aware of his notorious womanizing reputation. Earlier, Bridget had expressed her refusal to entangle herself with alcoholics, workaholics, peeping-toms, megalomaniacs, emotional F**Kwits, or any perverts. Tension builds when she learns of the rivalry between Daniel and Mark, stemming from a prior betrayal where Mark allegedly broke their friendship by having an affair with Daniel's fiancée.
As Bridget's relationship with Daniel deepens, she encounters Mark and his glamorous colleague Natasha (Embeth Davidtz) at a notable book launch. Bridging into a family gathering that was initially themed "Tarts & Vicars", she decides to combine the occasion with a mini-break getaway with Daniel. However, her ordeal begins when, on the morning of the event, Daniel abandons her for work, leaving her alone to navigate the costume party as the sole attendee in a Playboy bunny outfit. Mortified upon discovering the theme has been scrapped, she later finds Daniel with a naked American colleague, Lara (Lisa Barbuscia), leading her to end their relationship and pursue a fresh start in television.
Bridget's professional life flourishes as she finds her footing in a new job. Runs-ins with Mark continue, including meetings at a bed-and-breakfast and a friend's dinner party, where he confesses to appreciating her for who she truly is despite her flaws. As fate would have it, their feelings for each other begin to intensify during a botched birthday dinner attempt on Bridget’s part, which Mark graciously salvages.
An altercation arises when a drunken Daniel interrupts their celebrations, causing tensions to flare. Mark, feeling compelled to defend Bridget, confronts Daniel, leading to a brawl that spills out into the street. Mark triumphs but soon departs, leaving Bridget reeling from the complications of her emotions.
As Bridget learns more about the true events surrounding Mark and Daniel's estrangement, particularly that it was Daniel who betrayed Mark, she openly expresses her feelings for Mark, only to learn that he and Natasha are poised to leave for New York. During a heartfelt toast at a dinner party, Bridget moves Mark with her words about losing someone significant, prompting a flurry of unspoken feelings, but despite this, he leaves for the States, torn by indecision.
Just as Bridget prepares for a getaway to Paris with friends to mend her broken heart, Mark makes an unexpected return. In the midst of a tender moment as they lean in for their first kiss, Bridget excuses herself to change into "genuinely tiny knickers." In a moment of intrusion, Mark glances at her diary, finding a collection of critical thoughts about him. She returns to an empty space where Mark once stood, prompting a chase into the night.
In a twist of fate, as Bridget fears losing him forever, Mark appears, holding a fresh diary, proposing the chance for a new beginning. In the snowy streets, they finally share a kiss, sealing their connection amidst the cold, giving Bridget hope for the future ahead.
