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Prince William, Duke of Cambridge and his pregnant wife Catherine, Duchess of Cambridge leave the King Edward VII hospital where The Duchess was being treated for acute morning sickness.
Photo Credit: Indigo/Getty Images
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Catherine, Duchess of Cambridge arrives to Kings Cross train station.
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Catherine, Duchess of Cambridge attends the launch the Football Association's National Football Centre at St George's Park.
Photo Credit: Samir Hussein, WireImage/Getty Images
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Sophie Rhys-Jones, Countess of Wessex, Catherine, Duchess of Cambridge and Camilla, Duchess of Cornwall attend the annual Order of the Garter Service at St George's Chapel.
Photo Credit: Paul Edwards, WPA/Getty Images
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Catherine, Duchess of Cambridge visits Vernon Park during a Diamond Jubilee visit to Nottingham.
Photo Credit: Chris Jackson/Getty Images
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Catherine, Duchess of Cambridge takes part in a St Patrick's Day parade as she visits Aldershot Barracks on St Patrick's Day.
Photo Credit: Samir Hussein, WireImage/Getty Images
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Catherine, Duchess Of Cambridge visits Fortnum and Mason Store.
Photo Credit: Neil Mockford, FilmMagic/Getty Images
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Catherine, Duchess of Cambridge visits Rose Hill Primary School.
Photo Credit: Samir Hussein, WireImage/Getty Images
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Catherine, Duchess of Cambridge visits Alder Hey Children's Hospital.
Photo Credit: Phil Noble, WPA/Getty Images
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Catherine, Duchess of Cambridge and Crown Princess Mary of Denmark arrive for a visit to the UNICEF Emergency Supply Centre.
Photo Credit: Phil Noble, WPA/Getty Images
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Catherine, Duchess of Cambridge and Prince Harry depart for the Royal wedding of Zara Phillips and Mike Tindall.
Photo Credit: Mike Marsland, WireImage/Getty Images
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Catherine, Duchess of Cambridge visits the ENMAX Conservatory, Calgary Zoo.
Photo Credit: George Pimentel, WireImage/Getty Images
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Catherine, Duchess of Cambridge and Crown Princess Mary of Denmark arrive for a visit to the UNICEF Emergency Supply Centre.
Photo Credit: Phil Noble, WPA/Getty Images
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Catherine, Duchess of Cambridge and Prince Harry depart for the Royal wedding of Zara Phillips and Mike Tindall.
Photo Credit: Mike Marsland, WireImage/Getty Images
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Catherine, Duchess of Cambridge visits the ENMAX Conservatory, Calgary Zoo.
Photo Credit: George Pimentel, WireImage/Getty Images
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Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge arrive at the Victoria Barracks.
Photo Credit: Chris Jackson, Getty Images
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Camilla, Duchess of Cornwall, Catherine, Duchess of Cambridge, and Edward Stanley, Earl of Derby watch the Garter Service.
Photo Credit: Kirsty Wigglesworth, WPA/Getty Images
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Kate Middleton and Prince William visit City Hall.
Photo Credit: Niall Carson, WPA/Getty Images
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Kate Middleton attends day 4 of the Cheltenham Horse Racing Festival.
Photo Credit: Indigo/Getty Images
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Kate Middleton, HRH Prince William's girlfriend attends the Sovereign's Parade at the Royal Military Academy Sandhurst to watch the Passing Out Parade.
Photo Credit: Anwar Hussein, Getty Images
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Camilla, Duchess of Cornwall, Catherine, Duchess of Cambridge, and Edward Stanley, Earl of Derby watch the Garter Service.
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Kate Middleton and Prince William visit City Hall.
Kate Middleton has incredible style, that we all know to be true. But, did you know that Kate has a secret trick to her repertoire of looks? (Drum-roll, please) It's the knee-length coat.
From spring garden parties to fall field hockey tournaments, Kate knows the style value of a great coat that can instantly change your outfit. She's worn it with heels, with tights and knee high boots, and even fashioned it as a dress. She's shown the world that this valuable article of clothing can boost your outfit from hip to chic in no time.
Check out the gallery above for some of our favorite Kate-in-coat looks; we can't wait to see which one she will wear next!
More from StyleList:
Kate Leaves Hospital in Gorgeous Diane Von Fursteneberg Coat
The Royal Pregnancy Announcement of Will and Kate
Get Kate's Incredible Style - For Less!
WATCH: Details of Kate's Pregnancy
Kate Middleton Proves She's a True Royal In Wake of Topless Photo Scandal
Photo Credit: Getty Images
Kate Middleton's Style for Less
Kate Middleton Credited For Rise in Alexander McQueen Sales
