For day one of three days of the Queen’s big 9-0 birthday celebrations, Kate Middleton debuted a brand new addition to her ever-burgeoning collection of coats. 

Flanked by Wills and Haz, the Duchess of Cambridge arrived at a service of thanksgiving at St Paul’s Cathedral in a fresh Catherine Walker piece. She topped it with a fascinator that had all the feathers. 

HBD Queen E!