The Duchess of Cambridge officially opened the school on Monday morning (19 January), arriving in a beautiful pale blue cashmere coat that kept her baby bump nice and cosy.
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Despite the freezing temperatures in the capital, the 33-year-old opted for an above-the-knee dress and her favourite nude coloured tights.
Kate – who is around six months pregnant – met with students, staff and governors at the school, before enjoying a tour of the facilities.
She spent time in some lessons and the library, and unveiled a commemorative plaque which celebrated her visit and the school's official opening.
"We are thrilled that Her Royal Highness the Duchess of Cambridge will be visiting next week to officially open the school," said the school's Principal David Benson last week.
"Here at KAA we are providing much needed new secondary school places to our community, and are proud of the start we have made. Over 600 applications for next year reflects our growing reputation. Next week's royal visit is an important chapter in the history of our new school. Needless to say we are all very excited!"
Meanwhile, Sir Rod Aldridge, founder of the school's lead sponsor, Aldridge Foundation, said: "The Duchess, together with Prince William, opened our first academy in Darwen (Lancashire) in 2011, in what was one of the last official engagements they carried out before their wedding.
"We are thrilled that Her Royal Highness will be opening this wonderful new school in Kensington this month."
This is Kate's third public engagement in a week.
Last week, she visited a primary school in Ladbroke Grove, West London to officially launch the latest Art Room, which uses art therapy to help improve self-esteem and self-confidence in children.
Kate also attended a function at The Fostering Network in Islington, North London, to celebrate the work of foster carers in the community.
She is due to give birth to her second child in April.