Just Go with It

On his wedding day, Danny Maccabee overhears his fiancée admitting to her friends that she is only marrying him for his money and is already cheating on him. Distraught, Danny walks out and heads to a local bar. There, a woman approaches him but notices and asks about his ring. After claiming he is in an unhappy marriage, he wins her over.

Years later, Danny is a successful plastic surgeon in Los Angeles and has improved his appearance. He keeps his wedding ring, using it to continue feigning being in an unhappy marriage so he can seduce women he meets without having to face long-term romantic commitment. The only woman aware of his scheme is Katherine Murphy, his office manager and a divorced mother of two.

At a party, Danny removes his ring to tend to a child's scraped knee. Shortly afterward, he meets Palmer, a young sixth-grade math teacher. They spend the night on the beach together, but Palmer finds Danny's wedding ring in his pocket the next morning. Palmer is furious that he apparently cheated on his wife with her, citing that her own parents divorced because of infidelity. Instead of telling Palmer the truth, Danny claims he is getting divorced from a woman named Devlin Adams after she cheated on him with a man named Dolph Lundgren. When Palmer insists on meeting Devlin, Danny convinces Katherine to pose as her and give them her blessing.

After Palmer overhears Katherine talking on the phone with her children, Michael and Maggie, she assumes they are Danny's as well and requests to meet them. Danny convinces Michael and Maggie to go along with the scheme, though they blackmail him to take them all to Hawaii.

At the airport, they run into Danny's cousin Eddie, who is traveling in disguise as "Dolph Lundgren" while running from his ex-girlfriend's new boyfriend. To maintain the facade, Danny and Katherine are forced to bring him along.

At the resort in Hawaii, Katherine and Danny run into the real Devlin Adams, Katherine's frenemy from college, and her husband Ian Maxtone-Jones. Over time, Katherine becomes impressed by Danny and his way of interacting with her family. Danny, in turn, begins to develop feelings for Katherine.

As Danny is preparing to confess his feelings for Katherine, Palmer asks Danny to marry her the following day, having learned from a drunken Eddie of Danny's plans to get engaged. Though surprised by her proposal, Danny agrees.

Palmer asks Katherine if she still has feelings for Danny, which Katherine dismisses. Katherine runs into Devlin at a bar and admits that she pretended to be married to Danny to avoid embarrassment, and Devlin confesses that she is divorcing Ian, who is gay.

While Katherine is confiding in Devlin about her feelings for Danny, he arrives and announces he is not marrying Palmer because he is in love with Katherine, and they kiss. Palmer meets a professional tennis player who shares her interests, and Danny and Katherine eventually marry.