While the groom's first cousins, Princesses Beatrice and Eugenia, will be VIP guests at Prince William and Kate Middleton's April 29 nuptials, their mother -- the Duchess of York -- won't be included in any royal wedding festivities.

Why the snub? Sarah Ferguson, 51, was married for a decade to Prince Andrew (Prince William's paternal uncle) until her tabloid-mocked infidelities led to divorce in 1996; the exes quietly went on to raise their daughters as single parents. Last year, a mortifying undercover sting caught Sarah soliciting bribe money to "open doors" to her influential ex. The shamed royal will soon attempt image rehab with a new reality series, 'Finding Sarah,' on Oprah Winfrey's OWN channel.

But with 1,900 royal invitations being dispatched around the world for what could be the most expensive wedding ever, is the duchess appalled at being left out? According to People.com, her rep confirms that Ferguson plans to be overseas in late April, and calls the snub no surprise: "She will not be attending. She never expected to be invited."