“I think the fact that she’s always been my best friend has been the key.
“At the end of the day, we can sit down and laugh at each other and have a good time.
“It’s been an amazing 10 years.”
Mike and Zara, who recently welcomed their third child, celebrate their wedding anniversary next month.
The couple – who are parents to Mia, Lena and newborn son Lucas – tied the knot at Canongate Kirk in Edinburgh on July 20 2011.
Mike revealed he and Zara plan to go away to celebrate the special date.
He said: “Maybe Cornwall if we can’t go abroad.”
Princess Anne’s son-in-law also opened up on the kindness he has been shown by the Royal Family and praised the Queen for being an “amazing woman”.
He said: “I can only say how kind they’ve been to me, and how welcoming they’ve been to me since joining the family.
“And how they’ve made my family welcome.
“I’ve always felt part of it and I think that’s down to what an amazing woman the Queen is.
“They’re a fantastic family.
“How many families say that they will get together as a whole family six to eight times a year?
“It just doesn’t happen for me.
“I would like it to happen more, and this is where I have to perhaps learn a bit more from the wife, but it’s very rare.
“They’re very close and it’s great to see.”
Sour: EXPRESS CO UK