After writing a soon-to-be bestselling novel, writer and committed bachelor Harper attempts to hide the fact that his saucy new book is loosely based on the lives and loves of his tight-knit group of friends. Harper is set to be best man at his friend Lance's wedding, and all his friends will be in attendance. When an advance copy of the book makes its way into the hands of his ex-flame, Jordan, Harper attempts to keep it under wraps.

Two women plot revenge against the woman marrying their friend's ex-boyfriend.

With high school a distant memory, Jim and Michelle are getting married — and in a hurry, since Jim's grandmother is sick and wants to see him walk down the aisle — prompting Stifler to throw the ultimate bachelor party. And Jim's dad is reliable as ever, doling out advice no one wants to hear.

When two weddings are accidentally booked on the same day at the same venue, each bridal party is challenged with preserving their family's special moment while making the most of the unanticipated tight quarters. In a hilarious battle of determination and grit, the father of the bride and sister of the other bride chaotically go head-to-head as they stop at nothing to uphold an unforgettable celebration for their loved ones.

Peter Klaven is a successful real estate agent who, upon getting engaged to the woman of his dreams, Zooey, discovers, to his dismay and chagrin, that he has no male friend close enough to serve as his Best Man. Peter immediately sets out to rectify the situation, embarking on a series of bizarre and awkward "man-dates."

A commitment-phobic 27-year old’s relationship is put to the test when she and her boyfriend attend 7 weddings in the same year.

While dining out with friends, Sy suggests the difficulty of separating comedy from tragedy. To illustrate his point, he tells his guests two parallel stories about Melinda ; both versions have the same basic elements, but one take on her state of affairs leans toward levity, while the other is full of anguish. Each story involves Melinda coping with a recent divorce through substance abuse while beginning a romantic relationship with a close friend's husband.

Best pals Jason and Daniel indulge in casual flings and revel in their carefree, unattached lives. After learning that the marriage of their friend Mikey is over, they gladly welcome him back into their circle. The three young men make a pact to have fun and avoid commitment. However, when all three find themselves involved in serious relationships, they must keep their romances secret from one another.

Lifelong platonic friends Zack and Miri look to solve their respective cash-flow problems by making an adult film together. As the cameras roll, however, the duo begin to sense that they may have more feelings for each other than they previously thought.

During a wild vacation in Las Vegas, career woman Joy McNally and playboy Jack Fuller come to the sober realization that they have married each other after a night of drunken abandon. They are then compelled, for legal reasons, to live life as a couple for a limited period of time. At stake is a large amount of money.

Two lifelong friends navigate complex sexual encounters and emotional entanglements, wrestling with societal norms and personal desires.

Longtime single friends, Ben and Alice, agree to be each other's respective plus one at every wedding they're invited to, during a busy summer of wedding fever.

Though he began in stand-up comedy, Andre Allen hit the big-time as the star of a trilogy of action-comedies about a talking bear but now he wants to be taken seriously. His passion project about the Haitian Revolution, a movie called Uprize, was panned by the NY Times film critic. A couple days before the wedding to his reality star fiancée, he's forced to spend the day with Chelsea Brown, a profile writer for the New York Times. Unexpectedly, he opens up to her, and as they wind their way across New York, he tries to get back in touch with his comedic roots.

College "frenemies" Lauren and Katie move in together after losing a relationship and rent control, respectively. Sharing Katie's late grandmother's apartment in New York City, the girls bicker with each other until one fateful night, when Katie's noisy bedroom activities make Lauren barge in and discover a dirty little secret. This revelation brings them closer together, and Lauren (the brains) and Katie (the talent) concoct a wildly successful business venture. As profits swell, the girls reevaluate their hopes and dreams and realize that just because someone pees in your hair in college doesn't mean she won't be your best friend 10 years later.

Robbie, a local rock star turned wedding singer, is dumped on the day of his wedding. Meanwhile, waitress Julia finally sets a wedding date with her fiancée Glenn. When Julia and Robbie meet and hit it off, they find that things are more complicated than anybody thought.

John and his buddy Jeremy are emotional criminals who know how to use a woman's hopes and dreams for their own carnal gain. Their modus operandi: crashing weddings. Normally, they meet guests who want to toast the romantic day with a random hook-up. But when John meets Claire, he discovers what true love – and heartache – feels like.

On the eve of his wedding to his longtime girlfriend, unassuming nice guy Rick is dragged out for a night of debauchery by his friends.

Doug Harris is a loveable but socially awkward groom-to-be with a problem: he has no best man. With less than two weeks to go until he marries the girl of his dreams, Doug is referred to Jimmy Callahan, owner and CEO of Best Man, Inc., a company that provides flattering best men for socially challenged guys in need. What ensues is a hilarious wedding charade as they try to pull off the big con, and an unexpected budding bromance between Doug and his fake best man Jimmy.

All the couples are back for a wedding in Las Vegas, but plans for a romantic weekend go awry when their various misadventures get them into some compromising situations that threaten to derail the big event.

College student Beca knows she does not want to be part of a clique, but that's exactly where she finds herself after arriving at her new school. Thrust in among mean gals, nice gals and just plain weird gals, Beca finds that the only thing they have in common is how well they sing together. She takes the women of the group out of their comfort zone of traditional arrangements and into a world of amazing harmonic combinations in a fight to the top of college music competitions.