United Kingdom, Aug. 25 -- Kimberly Wyatt says the secret to a successful marriage is to "marry your best friend".

The 43-year-old singer has children Willow, 10, Maple, eight, and five-year-old Ford with her husband, model Max Rogers, 43, and Kimberly credits their strong friendship with making their marriage work.

She told The Mirror: "I guess, ultimately, you have to marry your best friend. Because you know, a relationship is work, and you have to be willing to go through the tough times as well as the good times, and work together to create the good times. Ultimately, we both want the same future and to create that loving family bond. I guess building a life that you both love and enjoy sharing brings longevity in your partnership."...