The minute Prince William and Kate Middleton - aka Catherine, the Duchess of Cambridge - confirmed that they are expecting their second child together, the public was on tenterhooks.

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When is she due? Is she REALLY having twins? And, perhaps most importantly of all, will it be a baby prince or a baby princess be joining the royal nursery?

A new report in The National Enquirer has claimed to have the answers for us, stating that the ultrasound of the Duchess during her 12-week checkup with Dr. Alan Farthing, the royal physician, has shown that she will not be having twins, as previously reported.

But the baby, due in April 2015, is reported to be a girl.

The royal couple could not be happier, a source added to the publication.

Jessica Hay, who is supposedly Kate Middleton's close childhood friend, also told the publication: "William and Kate had talked endlessly about how they'd love to have a little girl."

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In January, it was reported that Kate's mother, Carole, was urging the royal couple to have the second baby named after the late Princess Diana as a "beautiful tribute."

The report was supported by royal author Andrew Morton, who told The Sun: "Close friends to William and Kate have told me that if it is a girl they want to name the baby after Diana.

"They discussed girls' names before George was born and now they're hoping the next one is a girl so they can carry out their wish to honour William's mother. They're not too thrilled at the thought it will be shortened to Princess Di. But it won't change their minds."