Max Mumby/Indigo/Getty Images
Prince William knows what day it is.
Wednesday marks Duchess of Cambridge Kate Middleton's 37th birthday. While her celebration plans currently remain a secret, one thing is certain—her husband definitely didn't forget about the big day.
In fact, the royal had a public engagement on Wednesday morning, where he was given a special gift for his famous wife. William headed to the Royal London Hospital in honor of London's Air Ambulance Charity, for which he was just announced as a patron of their 30th Anniversary Campaign.
At the event, a young girl presented William with a handmade birthday card for the mother of three. "Kate, I hope you've had the best birthday you could ever imagine," 6-year-old Alma Shahar wrote.