Prince William and Kate Middleton are engaged and will marry in 2011, Clarence House announced today. The announcement came after speculation reached fever pitch following a visit by Kate’s parents to the Queen’s Scottish estate last month. The invitation was seen as a clear sign that the couple were poised to announce they were marrying. They have been together for eight years and have recently been spending much of their time in north Wales where William is a search and rescue pilot. Their wedding, scheduled for 2011, will be the biggest royal event since the wedding of William’s mother and father.