Though Ryan Reynolds and Blake Lively insist on being coy about when exactly they fell in love, all signs point to “Green Lantern.” The couple, who have three children together and are the epitome of what we call “couple goals,” were first pointed out, getting cozy in New York City during filming.
Though they called it a “friendship,” something about their connection seemed to end their own relationships at the time. Shortly after production ended, Blake broke up with boyfriend and “Gossip Girl” co-star Penn Badgley, and Scarlett Johannson divorced Ryan.
Daredevil
When Jennifer Garner and Ben Affleck started filming "Daredevil" in 2002, they were both in loving relationships. Affleck was a part of the power couple that we know as Bennifer (with Jennifer Lopez), and Garner was married to Scott Foley.
Though no one ever admitted to anything happening on-set, Affleck eventually confirmed that he and Jennifer (Garner) fell in love while filming. A year after the superhero flick premiered in 2003, Affleck ended things with Lopez, and unsurprisingly, Garner divorced Foley.
Mary Shelley's Frankenstein
Kenneth Branagh had been married to Emma Thompson for five years before the production of "Mary Shelley's Frankenstein" started, but little did they know that the film would change everything. The director and star of the film. Branagh couldn't deny his fascination with co-star Helena Bonham Carter.
Thompson filed for divorce not long after the news broke of Bonham Carter and Branagh's betrayal. Interestingly enough, Helena and Emma made peace and have no hard feelings. Kenneth and Emma, on the other hand...
Dream House
Rachel Weisz had been with director Darren Aronofsky for nearly ten years when she entered the production of "Dream House" with Daniel Craig. Craig was engaged at the time, but their connection seemed indisputable.
Both actors claim that working on "Dream House" together was the reason their respective relationships ended, but Rachel has opened up about where her relationship went south before meeting Craig. After ending both their relationships and filming, the couple went public, married a short seven months later, and have been together ever since!
Stage Beauty
Billy Crudup and Mary Louise Parker were never married, but the couple had been partners for eight years before a certain someone came between them. Parker was also seven months pregnant when Crudup left her for his "Stage Beauty" co-star Claire Dances in 2005.
Both Parker and Danes have shared their sides of the story. Parker has opened up about her devastation in her 2015 memoir, "Dear. Mr. You." While Danes doesn't deny her part in the affair, "I was just in love with Crudup and needed to explore that, and I was 24... I didn’t quite know what those consequences would be.