The Duchess of Cambridge with her new Kiki McDonough earrings

Well it was Christmas Day, so no doubt the Duchess of Cambridge thought she should add a little sparkle to her aubergine coloured tailored coat and Jane Corbett hat. That touch came from her new green amethyst drop earrings by designer Kiki McDonough. (Thanks to My Small Obsessions for the investigative work).

Kate's earrings clearly match the £1900 Kiki McDonough 18ct gold and diamond earrings show in citrine on the designer's website - but which Kate had clearly had customised with amethyst. Unsurprisingly, the earrings are already sold out - a sign that Kate continues to prove a fashion force, whether she's wearing high end or high street.

It's not the first time the Duchess has worn Kiki McDonough's designs. She opted for a pair of £495 citrine drop earrings at the Epsom Derby earlier this year and she's also been spotted wearing the Sloane Street designer's Grace earrings and diamond crucifix necklace.

It's clear Kate's growing very fond of the Chelsea designer, who also made jewels for her late mother-in-law. 'I once counted Princess Diana as one of my loyal customers and we always had such fun choosing designs for her to wear. It's a very special added extra that Catherine now enjoys wearing my designs too. As a 'modern Royal' Catherine is as chic when dressed down as she is at formal engagements - my jewellery is designed to be worn every day, and Catherine does this beautifully.'

Some are speculating Kate's latest Kiki McDonough earrings were a Christmas gift from her new husband, Prince William. But we say, Kate's a modem girl - so she's just as likely to have bought them for herself. And what's wrong with that!