And the rugby star had an admission for HELLO! magazine, who was there to exclusively capture the marriage of fellow player Iain Balshaw and his long-term girlfriend Kate Davies.
"I don't think it's about whether we will get married but when," said 30-year-old Mike, as he joined his royal partner and a line-up of rugby stars at the Cheltenham nuptials. "There is no doubt I love Zara but it has to be the right time."
In this week's issue, number 1084, there's a special report from the wedding, featuring pictures of best man Mike and Zara joining in with the celebrations. And the sportsman talks about his future with Princess Anne's daughter, which includes children.
Also in the current edition of the magazine, there's an exclusive look inside Jennifer Lopez's A-list 40th birthday bash, and a special portrait of Princess Beatrice as she turns 21.
And pick up your copy for the lowdown on Jude Law facing up to being a father again, and Boris Becker's baby news.
Read all the full stories in the new HELLO! magazine, on sale now.