Alyson Hannigan & Alexis Denisof
While all the celebs on this list met their significant others on the set of a film or television series, Alyson Hannigan and Alexis Denisof’s story is a bit different. They did meet on set while filming Buffy the Vampire Slayer back in the late 90s, but they only filmed a single season together. Their characters didn’t interact very much, but clearly, the stars left an impression on each other. The stars began dating in 1999 and married in 2003. They’ve been married for 20 years now, and they have two beautiful children together.