Eugenie first caused pregnancy chatter when she skipped her "dear" relative Lady Gabriella Windsor's royal wedding to Thomas Kingston in May, as well as the Chelsea Flower Show which she is known to attend every year.
Eugenie's absence from yet another key occasion is sure to raise eyebrows among royal fan watchers who are convinced Fergie's younger daughter is expecting her first child with husband Jack Brooksbank.
And that's not the only clue the Princess is pregnant.
Eugenie has been sharing a slew of social media throwback photos from her childhood in recent weeks, and has remained out of the spotlight save for a single panel appearance in connection with the charity she co-founded, The Anti-Slavery Collective, last week.
Princess Eugenie shared five photos from the event for which she donned a decidedly loose fitting grey top that hid her figure completely.
The pictures immediately sparked a storm in the comments section with one user declaring: "I think I see a baby!"
The Queen's granddaughter most recently sparked pregnancy rumours on the opening day of Royal Ascot on June 19.
Photos from the racecourse swiftly circulated showing a smiling Eugenie gently touching her stomach while talking to cousins Zara Tindall and Kate Middleton, herself a doting mother to Prince George, Princess Charlotte and Prince Louis with husband Prince William.
On Saturday, the Duke of Sussex and his American-born Duchess held a private christening for baby Archie at Windsor Castle.