In honor of the big day, her parents released new photos that were taken by her mom at Kensington Palace and at their home in Norfolk.
The Duke and Duchess of Cambridge are very pleased to share three new photographs— Kensington Palace (@KensingtonRoyal) May 1, 2019
of Princess Charlotte ahead of her fourth birthday tomorrow.
The photographs were taken in April by The Duchess at Kensington Palace and at
their home in Norfolk. pic.twitter.com/skf95Z44EZ
Though her parents often keep Charlotte and her siblings out of the spotlight, the little royal has made enough public appearances for fans to fall in love with her playful personality. At uncle Prince Harry's wedding to Meghan Markle last year, she memorably stole the show as a bridesmaid.
VIDEO: Princess Charlotte works the crowd at royal weddng of Prince Harry, Meghan Markle
Princess Charlotte, a great-grandchild of Queen Elizabeth II, is fourth in line to the throne. Charlotte's grandfather, Prince Charles, is first, followed by her dad, Prince William, followed by her big brother, Prince George. Her little brother, 1-year-old Prince Louis, is in line right behind her.
George, Charlotte and Louis are about to get a cousin. Aunt Duchess Meghan is expected to give birth any day now, if she hasn't aleady. The Duke and Duchess of Sussex said they are keeping their plans to themselves so they can have a chance to bond with the new baby privately before introducing "Baby Sussex" to the world.
In the video above, take a look back at the major family milestones of the Duke and Duchess of Cambridge and their kids.
PHOTOS: Will & Kate through the years
MORE ROYAL FAMILY COVERAGE
Royal baby watch: Will Harry and Meghan's Baby Sussex be an American?
Royal baby watch: Everything to know about Prince Harry & Meghan Markle's firstborn
Prince Harry, Duchess Kate make appearance without Duchess Meghan, Prince William at Anzac Day
The British royal family tree and the line to the throne
A look back at the wedding of Prince William, Kate Middleton