Given that she's pregnant with her third child (due in April), the Duchess's 36th birthday bash was a low-key affair, E! News reports. A source tells the publication she "celebrated privately with Prince William and the children. It's just a quiet celebration at home. No big party."
The Duchess was back to business the following day, taking her bump out for a spin to visit Reach Academy with children's mental health charity Place2Be. Kate Middleton has been royal patron of the mental health organisation since 2013.
She was dressed in a Seraphine floral maternity dress that she wore twice publicly when pregnant with Princess Charlotte, Daily Mail reports, teamed with navy Hobbs coat and navy pumps.
This article previously appeared on marie claire.