According to Yahoo News on Friday, Duke and Duchess of Cambridge, Prince William and Kate Middleton reportedly call their unborn baby "our little grape."

The publication alleged that the royal couple denoted this nickname to their baby because of its size at nine weeks.

"Nobody knows what William and Kate are calling their baby or even if they have decided on a name," a source told E! News.

In an exclusive video for UK internet news source, Mirror News, Middleton is seen greeting well wishers on Grimsby, England's street last week, where she reportedly revealed the baby's gender accidentally.

When a woman handed her a teddy bear, the dutchess is heard on camera saying "Oh, is this for our d... Thank you so much. It's very very sweet of you."

Sandra Cook, 67, another woman standing nearby said, "Did you say 'my daughter'?" In which, Kate replied, "No, no, no, no... I'm sure. I'm sure. We don't know so.."

Middleton is due in July, St. James's Palace office confirmed in January.