It’s a given that the Duchess of Cambridge, Kate Middleton, has a very busy life, what with many royal engagements as well as being a wife and mum-of-three, but who does she hang out with when it comes to mummy and royal duty downtime? Kate, 38, has a very tight knit group of friends made up of high profile names and successful ladies and the Duchess celebrated her 38th birthday with a handful of them as she invited them to join her for a week at her home, Anmer Hall, in January.