Pippa Middleton may be the sister of the future queen of England, but some would say she's let the connection go to her head ...

Catherine, Princess of Wales, has since shared that she completed ... as it was discovered during an abdominal surgery. But Buckingham Palace has not publicly shared what her diagnosis was.

The 43-year-old royal - who has been making a slow return to public duties after receiving undergoing abdominal surgery and chemotherapy last year - marked her first 'away day' outside of London since ...