Here are the happy couple posing during a night out in London this year. They announced they're getting married on Tuesday .
Zara has always been close to her cousin Prince William and now it looks like she'll even get married in the same year as him.
Zara's not only famous for being the Queen's grand-daughter, she's also well known for her horse riding skills. Here she is competing at the Burleigh Horse Trials.
Like her mum, Princess Anne, Zara's been riding for years and is known for being brave.
She's won quite a few prizes including a gold at the World Equestrian Games in Germany in 2006.
Zara was also crowned Sports Personality of the Year in 2006 after becoming world Champion.
To top off her honours list, she got a special prize from her grandmother called an MBE.
Her boyfriend Mike Tindall has been a pretty successful at sport too, playing Rugby Union for England 62 times and being part of the squad that won the world cup in 2003.
Looks like it's time for Zara's mum Princess Anne to buy a hat!