On 9 January, Catherine, Duchess of Cambridge, celebrates her 35th Birthday. Catherine is the wife of Prince William and became the Duchess of Cambridge upon their marriage on 29 April 2011. As a Duchess and the wife of Prince William, who is second in line to the throne, she has a life of public engagements. Her first official engagement with her husband was meeting Barack Obama, the President of the United States and his wife, Michelle Obama, the First Lady. The Duchess is involved in many charities, including The Royal Foundation of the Duke and Duchess of Cambridge and Prince Harry, a charity that supports many causes.