Kate opted for a deep green Alexander McQueen coat, velvet Gianvito Rossi heels and a hat from Lock and Co.
However, right now, the Duchess is not expecting a baby, and made this very clear on Sunday as she sipped on Guinness at the St Patrick's Day parade.
Donning a dark green coat, Kate also greeted a tall Irish wolfhound and mascot Domhnall while William, dressed in full military attire, took the salute during a march past. She paired it with a matching floral fascinator and green tourmaline and amethyst oval drop earrings by Kiki McDonough. But her most festive accessory of all was a gold shamrock brooch pinned to the outside of her jacket.
The Duke and Duchess of Cambridge met officers and warrant officers at their West London base today as Kate Middleton presented them with shamrocks, a custom that's believed to have first started back in 1901 by Queen Alexandra.
After watching the 350 soldiers march on Parade Square Kate was given a cheeky piece of parenting advice while cooing over a 12-week-old sleeping newborn.
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The couple were later toasted by the longest-serving Guardsman at the Guardsman's Lunch, and the duchess was formally thanked for presenting the shamrock.
The Duke and Duchess of Cambridge also led a minute's silence to pay respects to the New Zealand terror attack victims.
In times of war, the shamrock is shipped out to them to be tucked into their Kevlar helmets, and for those at home the ultimate honour is to have it presented by a senior female member of the royal family.
Drummer David Murray, his regimental handler, said the St Patrick's Day parade was "number one" in his calendar and like a "second birthday".