Kate Middleton's known for being the ideal royal who attends every big event no matter what - let's not forget her fronting up to Meghan Markle and Prince Harry's wedding just weeks after giving birth to Prince Louis.
Meghan Markle and Prince Harry stepped out for Charlie van Straubenzee's wedding this weekend, but Kate Middleton and Prince William were notably absent. Pippa's exact due date isn't publicly known, and this all just stems from some very logical guess work.
Kate Middleton isn't the only royal rumoured to be potentially not attending Princess Eugenie's wedding.
The 36-year-old's younger sister is expecting her first child with her husband, James Matthews, in October so there is a chance the two events could clash.
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Reportedly, the birth of Kate's niece will coincide with the wedding, and she wants to devote her time to Pippa and her newborn.
With Princess Eugenie set to tie the knot with her wine merchant fiancé Jack Brooksbank on October 12th, it's been revealed Kate might be forced to choose between royal commitments and her sister, Pippa Middleton.
In fact, the Duchess of Cambridge has already given Pippa a few hand-me-downs of Prince George and Princess Charlotte. "Kate and Pippa have had so much fun shopping online for baby clothes and accessories!"
The wedding will be taking place at St George's Chapel in Windsor Castle and most of the royal family are expected to be in attendance.