Ex-royal family member Sarah Ferguson didn't get an invite to the royal wedding, but she believes Diana would be so proud of William. In an excerpt from an interview that airs tomorrow on Oprah, the scandal-prone Duchess of York says Kate looked gorgeous on the big day, but she felt "totally worthless" after not being invited, as well as ostracized on account of her past behavior. Sarah explains she wanted to be there with her girls, Princesses Eugenie and Beatrice, as they got dressed in those now-infamous hats and outfits, but luckily her ex and William's uncle, Prince Andrew, made her feel part of the day. She recalls, "We were talking all morning and he was saying, 'It's OK, just remember we had such a good day, our wedding was so perfect.'" Watch the preview now.