Kate Middleton Turns 31: How She's Celebrating Her Birthday

Kate Middleton Turns 31: How She's Celebrating Her Birthday

Put another candle on the cake for Kate Middleton!

The pregnant Duchess will have a lot to celebrate when she turns 31 on Wednesday, Jan. 9, her first birthday as a mom-to-be. But don't expect a big royal bash in her honor.

PHOTOS: How Kate is prepping for baby

Prince William's wife will be "spending her birthday privately," a St. James's Palace rep tells Us Weekly.

In fact, the celebration is likely to be even more subdued than last year's intimate dinner for family and friends at Kensington Palace. "She just wants something low-key," a source tells Us. "I suspect she will spend it at her parents' house." (Carole and Michael Middleton live in Bucklebury, Berkshire.)

PHOTOS: Kate and Will's first year of marriage

Of course, the Duchess of Cambridge already got the greatest gift of all: the news that she and Prince William, 30, will be parents in 2013.

PHOTOS: Royal pregnancies

"Trying for a baby has been their priority," a royal confidant told Us of the couple in December. "They're both excited to be focusing on a new chapter in their lives."

This article originally appeared on Usmagazine.com: Kate Middleton Turns 31: How She's Celebrating Her Birthday