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Isla Fisher And Sacha Baron Cohen
Length of Engagement: 6 years

The two actors began dating in 2002 and got engaged two years later, in 2004. They waited six years before heading to Paris to get married in an intimate ceremony with just six guests in 2010.

"Choosing to be together every day is incredibly romantic. I love marriage. I think it's a wonderful institution and it's the most important decision you make," she told Australia's Sunday Telegraph.

The couple had a long engagement partly because of their busy careers, but also because Fischer needed time to convert to Cohen's religion — Judaism. Fischer said, "I will definitely have a Jewish wedding just to be with Sacha. I would do anything — move into any religion — to be united in marriage with him. We have a future together, and religion comes second to love as far as we are concerned."