In addition to this, royal fans believe Eugenie had a certain glow about her at Royal Ascot.
The princess was also captured resting her arm protectively over her stomach, a dead giveaway.
“Eugenie is pregnant. She’s got that lovely soft curve shape of a blossoming mummy. But then Zara side on looked like she was camouflaging a small bump too," wrote a fan.
In another image, the Princess of York seemed to be telling exciting news to Zara Tindall.
From observing their wide smiles, fans were immediately convinced the conversation was pregnancy-related.
Perhaps the most telling sign was at Celine Dion's British Summer Time Hyde Park concert in London earlier this month, which Eugenie attended with her sister, Beatrice.
The 29-year-old reportedly avoided drinking any alcohol throughout the night, fueling the pregnancy rumours further.
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Beatrice and Jack will also be joining the royal family for a seasonal break, retreating to Balmoral Castle in Scotland.
The beautiful surroundings and company of family definitely set the scene for a special announcement.