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Published 12:39 25 Jan 2018 GMT
Updated 12:46 25 Jan 2018 GMT

She also wore a blue coat when visiting Roe Green Junior School in London last week and was also spotted in a deep blue dress.
Then, there was the navy blue coat she wore at the beginning of January when visiting London's Reach Academy Feltham on behalf of her work as patron of mental charity Place2Be.
Oh and if we go way back to her first appearance after the pregnancy was announced, she also wore blue, choosing a blue Temperley dress for a reception at Buckingham Palace.
Could there be something in it? We'll just have to wait and see...Explore more on these topics: