Prince Charles isn't the only member of the royal family to be celebrating a landmark birthday next year. Autumn Phillips (left) will be turning 40 on May 3, Princess Beatrice (second from left) will hit the big 3-0 on August 8th, and Mike Tindall (right) celebrates his 40th on October 18. The royal family are a close-knit bunch, so there are sure to be lots of celebrations to mark their milestones.