Meanwhile royal fans are eager to ascertain what Princess Eugenie is wearing for her big day.
A source said: "When this date was proposed, she said that regrettably she couldn't come".
New details released by Buckingham Palace reveal some important additions to Eugenie and Jack's nuptials, including a description of the wedding cake that has royal fans salivating. Princess Eugenie and Mr Brooksbank met at the Swiss resort of Verbier where Eugenie was on a family vacation celebrating her father's 50th birthday.
While some were quick to judge Camilla on social media for her absence, royal correspondent for CNN, Victoria Arbiter defended the Duchess on Twitter. "Camilla didn't want to let anyone down".
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There was also speculation that Kate Middleton would not be able to attend the wedding, as her sister Pippa Middleton is expected to give birth to her first child any day now.
Princess Eugenie and Jack Brooksbank have been dating for seven years and announced their engagement in January.
According to a previously-shared press release, "The attendees will view the arrival of the congregation and members of the Royal Family, listen to a live broadcast of the marriage service and watch as the bride and groom depart St George's Chapel at the end of the ceremony".