When a wellwisher gave the former Kate Middleton a teddy bear during a rare public appearance Tuesday, one woman in the crowd said she heard Kate respond: "Thank you, I will take that for my d..." before she broke off her comments.
It was unclear from video footage of the exchange whether the Duchess had made the comment.
When another woman in the crowd asked her "Did you say my daughter?" Kate could be heard to say "No, no no no I'm sure, I'm sure. We don't know yet."
That reported exchange was enough for Britain's tabloids to trumpet "It's a girl" in Wednesday's papers.
During Tuesday's appearance, another member of the public told the Duchess that she was waiting for her become Queen.
"You'll be waiting an awful long time," the Duchess responded, to the laughter of the crowd.