It’s officially Princess Charlotte‘s 4th birthday! It seems like just yesterday when Kate Middleton and Prince William stood outside The Lindo Wing at St Mary’s Hospital for the second time as they introduced their first daughter to the world on May 2, 2015.

To celebrate the special occasion, Kensington Palace shared a series of official birthday portraits along with a sweet message for the little royal.

The Duke and Duchess of Cambridge are very pleased to share three new photographs of Princess Charlotte ahead of her fourth birthday,” the caption read in a series of Instagram posts shared by the royal family. “The photographs were taken in April by The Duchess at Kensington Palace and at their home in Norfolk.”

As royals fans continue to send their best wishes to the special little girl, take a walk down memory lane and reminisce on the cutest photos of Charlotte throughout the years!