Kate Middleton shares sweet update on Prince Louis following his third birthday

We still can't believe last month marked Prince Louis' third birthday!

Following the young royal's special day, the Duchess of Cambridge gave fans a sweet update on her youngest son.

According to Kate Middleton, she is having trouble keeping up with the Prince.

The Duchess made the revelation while speaking to four-year-old Mila, who appears in Kate's new book of photography, Hold Still: A Portrait of Our Nation in 2020.

Mila is the subject of the image, Shielding Mila, which showcases her isolation during chemotherapy.

When she spoke with Kate this week, she asked after Prince Louis.

To which the mother-of-three revealed: "Louis has gotten so big now — he's very quick running around.

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"And he's on his little scooter as well. He's very quick. I can't keep up with him!'

Too cute!