Queen Elizabeth II will be marking her 90th birthday on April 21, and in a new documentary, The Queen at Ninety, honoring the milestone, Kate Middleton opened up about her children's close bond with their great-grandmother. On top of revealing that the queen was "really thrilled" that Kate had a little girl, she added, "I think as soon as we came back here to Kensington, she was one of our first visitors here." The duchess also disclosed Prince George's nickname for his great-grandmother — and it's beyond precious!
The appearance marks Kate's first solo TV interview since she became a part of the royal family back in 2011. Watch the clip above now, and then look back at all the comical interactions Kate and the queen have had through the years.