Kate Middleton Birthday! Pregnant Duchess Of Cambridge Turns 31 (PICTURES)

Happy Birthday Kate! The Duchess of Cambridge turns 31 today, capping a remarkable year in the life of the young royal.

The mother-to-be has been keeping a low profile of late, having been hospitalised in December with a form of acute morning sickness, called hyperemesis gravidarum, and is limiting her public engagements while she recovers.

Happy Birthday Kate!

Kate married William on April 29 2011 in a glittering Westminster Abbey ceremony in front of a television audience of billions.

As the couple nest in preparation of the arrival of their first child, we've brought you 31 photographs of the birthday girl.

31 Best Moments Of The Duchess Of Cambridge

Oh go on, here's a few more too...

The 70 Best Pictures Of Kate Middleton The Duchess Of Cambridge