Credit: Chris Jackson/Getty Images: Slaven Vlasic/Getty Images (Inset)

When Prince William and Kate Middleton say "I do" in front of approximately 1,800 invited guests April 29, one famous figure will not be in attendance.

Duchess of York Sarah Ferguson will skip the ceremony, as her rep confirms that the 51-year-old Ferguson was not invited and is not a member of the royal family.

The former royal's 10-year marriage to Prince Andrew ended in 1996. Though they split amicably, News of the World later caught Ferguson attempting to sell access to her ex to an undercover journalist.

A spokesperson for Prince William, 28, and his longtime girlfriend, 29, has confirmed that Prince Harry will serve as William's Best Man, while Middleton's sister Pippa will be Maid of Honor.

The service itself will begin at 11 a.m. at Westminster Abbey with three different clergymen taking part in the ceremony: the Dean of Westminster will conduct the service, the Archbishop of Canterbury will preside over the vows, and the Bishop of London will give the address.