The Duchess was lovely in a blue double-breasted Philosophy Di Lorenzo Serafini blazer, paired with a pair of black trousers, black suede booties with chunky heels and Kiki McDonough laurel leaf earrings.
Prince William matched his wife in a dapper blue jacket, paired with a white shirt and navy chinos.
Kensington Palace announced in September that Kate Middleton and Prince William have a third royal baby on the way, and we could not be more excited.
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Mother of two Kate made sure to cover up her bump on the chilly day in London, looking effortlessly stylish in a blue Balmain-inspired blazer featuring statement gold buttons by Philosphy Di Lorenzo Serafini, which retails at £760.
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The Official Twitter account for Kensington Palace have confirmed that Kate would give birth to Britain's next royal baby in April 2018.
The newborn will join the royal couple's older children - 4-year-old son Prince George and 2-year-old daughter Princess Charlotte. It was a gesture from us as a welcome to the club really.
"For me, getting kids doing sport instead of sitting in front of computers is great".