Wait… is Kate Middleton pregnant with Baby No. 3?!

The 34-year-old Duchess of Cambridge visited a Cub Scout meeting — to celebrate the organization's 100th anniversary! — in King's Lynn, England on Wednesday, Dec. 14. But it was Kate's gestures that really caught royal fans' attention, as she couldn't stop holding her stomach during the fun outing!

If Kate is expecting, this would be her third child with husband Prince William, 34. The couple — who married in April 2011 — are parents to son Prince George, 3, and daughter Princess Charlotte, 1.

kate middleton getty images

Kate on Dec. 14.

This past fall, a source close to the royal family revealed Kate and William are very eager to expand their brood. “It would not surprise me if they were pregnant by Christmas," the insider said.

MUST SEE: Prince Harry and Meghan Markle are Engaged — Find Out Why She Won't Wear Her Ring!

"I think they both would have been overwhelmed at the thought of a third child a year ago,” the source added. “But now it sounds perfect. They've both always wanted a big family."

Click through the gallery below to see all the new photos of Kate holding her belly!