Kate Middleton celebrates her 31st birthday Wednesday, but it’s likely to be a low-key celebration given her recent health issues related to her pregnancy.

St James's Palace said the Duchess of Cambridge would mark the occasion "privately", and she is understood to be with her husband, Prince William, at their home in north Wales.

As Breaking Celebrity News has previously reported, Kate was treated last month for a severe form of pregnancy sickness known as hyperemesis gravidarum, whose symptoms include sustained bouts of nausea and vomiting.

The Duchess was admitted to a private hospital in London on December 3, which forced the palace to announce that she was in the very early stages of pregnancy.

No doubt adding to her stress – the death of a well respected nurse at the hospital who took her own life after she unwittingly was tricked by two Australian deejays into transferring a call to a nurse on Kate’s floor, who then released confidential medical information about the Duchess’ condition.