Anna Paquin and Stephen Moyer

With a swoony vampire love story on “True Blood,” this popular TV couple took their romance off-screen before the show even aired. Sparks flew during screen testing, and Stephen said that by “day three or four,” he knew he wanted to spend the rest of his life with her. The couple wed in 2010 and have fraternal twins together.

Mila Kunis and Ashton Kutcher

While some might raise an eyebrow at the age difference between these two when they first played an onscreen couple in “That ‘70s Show” (Mila was just 14), they didn’t officially become an offscreen couple until years later. What started out as a friendship soon turned into fireworks. We love a slow-burn romance!

LeAnn Rimes and Eddie Cibrian

This couple’s relationship launch was embroiled in controversy after it was revealed that their origin story involved both of them cheating on their partners. They met on the set of the Lifetime movie “Northern Lights,” had an illicit affair before divorcing their partners, and feuded with their exes before tying the knot in 2011.