Popsugar Celebrity The Royals Prince William at the Royal London Hospital January 2019 These Kids Gave Prince William a Birthday Card For Kate Middleton, and His Reaction Was the Best 9 January 2019 by Brea Cubit Image Source: Getty Prince William might have had a solo engagement on Wednesday, but that doesn't mean he forgot about Kate Middleton's birthday! The 36-year-old Duke of Cambridge visited the Royal London Hospital and was honoured as the patron of London's Air Ambulance's charity campaign. Kate, instead, stayed behind with their three kids, Prince George, 5, Princess Charlotte, 3, and 8-month-old Prince Louis. During William's visit, a group of kids at the hospital presented the prince with a birthday card for Kate, who turned 37 that same day. Reporter Rebecca English tweeted a video of the adorable exchange, in which William thanks the children for their birthday wishes. "Well done for remembering," he said. He also assured everyone that he didn't forget the Duchess of Cambridge's special day, adding, "I did remember this morning, so that was okay!" The card's handwritten message read, "Kate I hope you've had the best birthday you could ever imagine." It sure seems like William and Kate are starting off 2019 on a high note. On Jan. 6, the royal duo made their first outing of the year when they headed to St. Mary Magdalene Church in Sandringham. And if their appearances from 2018 are any indication of what will come this year, we can expect to see William and Kate at several other charity functions, gatherings, and sporting events. Related: Prince William and Kate Middleton's Family Is Just as Sweet as Their Royal Romance William didn’t forget Kate’s 37th birthday today! pic.twitter.com/qt6kVRQp4J— Rebecca English (@RE_DailyMail) January 9, 2019 1 / 13 And this was the birthday card that Arielle, Omri and Alma made for Kate today that William thought so sweet (and approved of the handwriting) @LDNairamb pic.twitter.com/AAmQn5pEhG— Rebecca English (@RE_DailyMail) January 9, 2019 2 / 13 Image Source: Getty / WPA Pool 3 / 13 Image Source: Getty / WPA Pool 4 / 13 Image Source: Getty / WPA Pool 5 / 13 Image Source: Getty / IAN VOGLER 6 / 13 Image Source: Getty / WPA Pool 7 / 13 Image Source: Getty / WPA Pool 8 / 13 View this post on Instagram 🚁 The Duke of Cambridge, #30YearsSavingLives Patron, visited Royal London Hospital to learn more about the challenges @LDNairamb face in their life saving work as a first responder in the capital. A post shared by Kensington Palace (@kensingtonroyal) on Jan 9, 2019 at 9:32am PST 9 / 13 Image Source: Getty / WPA Pool 10 / 13 Image Source: Getty / WPA Pool 11 / 13 Image Source: Getty / IAN VOGLER 12 / 13 Image Source: Getty / WPA Pool 13 / 13 The RoyalsThe British RoyalsPrince WilliamKate Middleton