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10/10/2013 08:03 am ET

Robin Thicke On Wife Paula Patton: 'We Are Madly In Love' (VIDEO)

High school sweethearts and Hollywood power couple, singer Robin Thicke and actress Paula Patton, have been together for 20 years. What's their secret? In the above clip from this Sunday's episode of "Oprah's Next Chapter" on OWN, Oprah asks Thicke how he and Patton have made their relationship last.

"You pretty much take it one day at a time," Thicke says. "The one thing I've realized about loving somebody is you have to love them every day. Like people think, 'Oh, I'll get to loving you on Saturday.' Or 'I don't have time this week.'"

"And the thing is that people are changing every day -- their thoughts, their desires, their insecurities change every day," he says.

"I heard you describe it recently as the most 'functional dysfunctional' marriage," Oprah says. "What does that mean?"

Thicke laughs. "Just meaning that we're no different than any couple out there, and we have our fights, we have our problems," he says. "But somehow, there is this big bang theory that just pulls us close to each other and we are madly in love. Can't quit each other."

Oprah's full interview with Thicke on "Oprah's Next Chapter" airs Sunday, October 13 at 9 p.m. ET on OWN.

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