United Kingdom, Oct. 24 -- Kristen Bell thinks a happy marriage requires consistent "compromise".

The 45-year-old actress has been married to Dax Shepard since 2013, and she's opened up about her own approach to relationships, likening herself to a "puzzle piece that fits with someone else".

The Hollywood star - who has daughters Lincoln, 12, and Delta, 10, with Dax - told Andy Cohen Live: "I don't like the idea that you're looking for your perfect puzzle piece because you also have to become a puzzle piece that fits with someone else.

"So if you find two people that are like, 'Yeah, we're going to make this work and that means we're going to compromise constantly and those compromises should work well for both of us.' And sometimes it...