Happy birthday to Kate Middleton, who has had quite the eventful year, wouldn't you say?

The royal mom-to-be turns 31 on January 9, which will be her last birthday before she has a little one running around.

And how does she plan to ring in the big 3-1? It will actually be a rather subdued affair, according to Us Weekly.

She will be "spending her birthday privately," says a rep for the family. 

"She just wants something low-key," reveals another source. "I suspect she will spend it at her parents' house."

It makes sense that she'll keep things low-key, since she won't have much time to relax when the baby comes! 

Source: Us Weekly