Kate, the Duchess of Cambridge will take over as Queen of England in decades to come, but preparations are already underway for the Duchess to step into the honourable role, Express.co reports. Kate will take over as Queen when her husband, Prince William, is crowned king. However, the mother-of-three is already on her way to learning the ropes, taking part in several events in order to lay the groundwork for the important job. Kate's very first solo engagement with the Queen at King's College London was to prepare her for when she is crowned Queen, a royal expert has said. Royal expert Rebecca Long told Us Weekly: “Kate’s been taking on new responsibilities little by little over the last few years, so it won’t be a shock when the time comes.