Blake Lively and Ryan Reynolds

Green Lantern may have flopped at the box office but it did lead to love. On the set of the superhero film in 2010, sparks flew between Blake and Ryan - then they turned chemistry into a long-term romance.

However, the pair didn't begin a relationship until a year after the movie.

Reynolds said of their first date: "About a year after Green Lantern had come and gone and we were both single, we went on a double date – she was on a date with another guy, and I was on a date with another girl – and it was like the most awkward date for the respective parties because we were just like fireworks coming across."