United Kingdom, Feb. 18 -- Kristen Bell thinks "foundational trust" is the key to a successful marriage.

The 44-year-old actress has been married to actor Dax Shepard, 50, since 2013 and has Lincoln, 11, as well as nine-year-old Delta with him and noted that even if he may spend his day "hooking up" with others on set, she knows he will always come home in the end.

Asked about the secret to the success of her relationship, she told E! News: "Foundational trust.

"Even if Dax hooks up with the most beautiful person in the world at work, I know he's committed to our family. I know he's coming home. I know he loves our children. I know he strives to be a great husband and father."

The 'Frozen' star added that there may come a time when sh...