By George, he’s walking! In honor of his first birthday tomorrow, Kensington Palace released this photo of Prince George as part of a three-part photo series to commemorate the little prince’s big day.

Looking adorable in a navy blue polo shirt and seersucker overalls (a signature look for the young prince), George shows off his newly finessed walking skills at a butterfly exhibit at London’s Natural History Museum. We first saw him toddling around last month with a bit of assistance of mom Kate Middleton during a Father’s Day polo match, but now the soon-to-be 1-year-old is flying solo. He’s growing up so fast!

Until the palace releases the next photo, get your Prince George fix by checking out 17 of our favorite photos from his first year.