1. Sunshine in Sydney
It's one of Kate's standout looks and it will take some beating. When she stepped off the plane in Australia in 2014, the Duchess of Cambridge was wearing a bright yellow Roksanda Ilincic dress and rather fabulous it looked too. The knee length dress, paired with nude shoes, was a stunner of a look and very modern and rather different from some of Kate's more traditional picks. A winner by a mile.
2. Sparkle in Scotland
Just after her first wedding anniversary, Kate attended the annual Thistle ceremony in Edinburgh where she donned a pale yellow coat dress. The outfit itself was rather lovely but the duchess's decision to add a beige hat, black shoes and a black bag hidden by the red Stathearn tartan left this yellow in peril.
3. Nauti and rather nice
Yellow became a colour of choice for Kate on her Diamond Jubilee tour of the Far East with William in the early autumn of 2012. And by far the best of the lot was a pretty yellow broderie anglaise dress worn for a visit to a primary school in Nauti in Tuvalu. It was summery and chic and still very smart and the perfect match for the garland of flowers she was given to wear in her hair. William had less luck matching his crown and clothes.
4. The laid back look
5. A Marilyn Moment
It's a set of photos that the Duchess of Cambridge may choose to forget. In 2008, not long after her split from Prince William, Kate headed to a roller disco in London where she took to the floor in a sparkly green top and very yellow hot pants. She also fell over in a famous photo that showed how the then Miss Middleton could giggle over just about anything. She had the last laugh - two years later she was engaged to her handsome prince.
7. Butter yellow for a bump
Kate was no shrinking violet when it came to maternity wear. Dressing a bump in yellow is a pretty hard call but she managed it spectacularly at a garden party at Buckingham Palace just weeks before Prince George was born in 2013. The lightly patterned coat with its cream accessories was just about as yummy a pre-mummy outfit as you can get.
8. Yummy mummy
But the most famous of all is surely the yellow print Jenny Packham dress worn to bring Princess Charlotte home from hospital just ten hours after her birth on May 2nd 2015. The pretty knee length dress worn, as we'd expect with those famous nude heels, was the perfect pick for a spring day and perhaps proved Kate didn't know the gender of her second baby as she'd gone for something neutral that would have said boy or girl. In the end, it was a princess in the arms of this duchess and perhaps the best time of all that Kate has worn yellow.