"I think what I felt was that I went through the phase of feeling so totally worthless and that [it] was quite right they didn't invite me.”
Fergie told Oprah that she believed Prince William's mother, the late Princess Diana would have been "so proud of her son”.
She said: "I'm here to say how proud she would have been and Kate looked utterly beautiful."
According to Express, Fergie was invited to Prince Harry and Meghan Markle's wedding in 2018 but was excluded from the evening reception at Frogmore House (which Prince Charles hosted).
The Duchess was said to be "deeply upset" by her exclusion, with a source telling The Daily Mail that Fergie has been complaining "to anyone who will listen."
"Numbers are limited to the evening party," the source told the publication.
"She is not a member of the Royal Family any more and Prince Charles simply doesn’t have time for her.
"He just can’t see why she is still such a big part of his brother’s life."