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.

Aging pals Billy, Paddy, Archie, and Sam have been best friends since childhood. When Billy finally proposes to his much-younger girlfriend, all four friends go to Las Vegas to celebrate the end of Billy's longtime bachelorhood and relive their glory days. However, the four quickly realize that the intervening decades have changed Sin City and tested their friendship in ways they had not imagined.

Reuben Feffer is a guy who's spent his entire life playing it safe. Polly Prince is irresistible as a free-spirit who lives for the thrill of the moment. When these two comically mismatched souls collide, Reuben's world is turned upside down, as he makes an uproarious attempt to change his life from middle-of-the-road to totally-out-there.

When a rich woman's ex-husband and a tabloid-type reporter turn up just before her planned remarriage, she begins to learn the truth about herself.

A runaway heiress makes a deal with the rogue reporter trailing her but the mismatched pair end up stuck with each other when their bus leaves them behind.

Poppy's a free spirit. Alex loves a plan. After years of summer vacations, these polar-opposite pals wonder if they could be a perfect romantic match.

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.

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.

Intertwining couples and singles in Los Angeles break-up and make-up based on the pressures and expectations of Valentine's Day.

When she receives word that her longtime platonic pal Michael O'Neal is getting married to debutante Kimberly Wallace, food critic Julianne Potter realizes her true feelings for Michael -- and sets out to sabotage the wedding.

Carl Allen, a guy whose life is going nowhere, signs up for a self-help program based on one simple covenant: say yes to everything…and anything.

Mild mannered tax accountant Elliot Sherman is what he calls a "Baxter": the kind of calm, unexciting fellow who "wears sock garters" and "enjoys raking leaves." Loved by bosses and parents, Elliot is a perfectly nice guy. And that's his problem.

Steve, a happily married American man living in London meets Vicki, an English divorcée and run off to Marbella for a rollicking week of sex. They then return to London to set up a cozy menage, despite the fact that he loves his wife and children, and now realize that he and Vicki have also fallen in love.

A pair of buddies conspire to save their best friend from marrying the wrong woman, a cold-hearted beauty who snatches him from them and breaks up their Neil Diamond cover band.

Tom and Hannah have been platonic friends for 10 years. He's a serial dater, while she wants marriage but hasn't found Mr. Right. Just as Tom is starting to think that he is relationship material after all, Hannah gets engaged. When she asks Tom to be her 'maid' of honor, he reluctantly agrees just so he can attempt to stop the wedding and woo her.

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."

Years after her ship disappeared, a presumably dead woman returns home. To her shock, she finds her husband has remarried.

When bachelor Walter Davis is set up with his sister-in-law's pretty cousin, Nadia Gates, a seemingly average blind date turns into a chaotic night on the town. Walter's brother, Ted, tells him not to let Nadia drink alcohol, but he dismisses the warning and her behaviour gets increasingly wild. Walter and Nadia's numerous incidents are made even worse as her former lover David relentlessly follows them around town.

When Larry and Maria learn that their respective spouses are cheating on them, they try to turn the tables on them by pretending to have an affair. However, they soon find themselves falling in love.

Best friends since they were kids, Rabbi Jacob Schram and Father Brian Finn are dynamic and popular young men living and working on New York's Upper West Side. When Anna Reilly, once their childhood friend and now grown into a beautiful corporate executive, suddenly returns to the city, she reenters Jake and Brian's lives and hearts with a vengeance. Sparks fly and an unusual and complicated love triangle ensues.