The 31-year-old, who has two daughters with Warren, said she instantly knew they would stay together forever, reported Showbizspy.
"I just knew when I met him that I was going to know him forever. It was weird; he instantly felt like family. I'd never felt like that with anyone. We got each other. We're kindred spirits," she said.
Alba has daughters Honor, four, and 16-month-old Haven with Warren after tying the knot in 2008. Although their love is still strong, her notion of romance has changed over time.
"On a weekend Cash might say, 'Go get your nails done with a girlfriend. Haven is down for a nap and Honor and I will play. I know you work hard. You deserve some time for yourself'.
"That, to me, is romantic. He's saying, 'You matter', and that I'm more than just the mother of the kids or the wife who goes out to events with him."
