WATCH: Marlo Thomas and Phil Donahue, now married 40 years, profiled on “CBS Sunday Morning”

What a magnificent couple.

Marlo Thomas and Phil Donahue are celebrating their 40th anniversary this spring. To mark the occasion, the actress and talk-show host wrote a book, “What Makes a Marriage Last,” in which 40 famous couples share secrets on how their marriages have stood the test of time.

Jane Pauley profiles the pair for CBS Sunday Morning.