Kate MIddleton rocked a casual ensemble for a Tuesday outing at the Natural HIstory Museum in London. The visit follows Prince William’s 39th birthday on Monday. The royal received some love from his dad, Prince Charles, and grandmother, Queen Elizabeth II, on social media. On Sunday, the Duke of Cambridge celebrated Father’s Day with his two eldest children, Prince George and Princess Charlotte, at a half marathon in Norfolk, England. Of course, this all follows the birth of Meghan Markle and Prince Harry’s second child, Lilibet. Earlier this month, the Duchess of Cambridge told reporters that she can’t wait to meet her new niece.