Charlotte's best moments: A tantrum on the tarmac to meeting Louis at the Lindo
Princess Charlotte has had a busy year - starting nursery, heading on an overseas tour - and welcoming a new baby brother.
As she celebrates her third birthday on Wednesday, here's a look a some of her best moments.
Meeting Prince Louis
Charlotte took centre stage on the day her baby brother Prince Louis was born when she visited him in hospital.
Alongside shy older brother Prince George, it was Charlotte who waved to photographers as she led her father the Duke of Cambridge up the steps of the Lindo Wing.
The royal youngster even professionally turned around for one more wave as she headed excitedly inside to meet the newborn prince.
The young princess began nursery, starting at Willcocks Nursery School close to her Kensington Palace home.
The Duke and Duchess of Cambridge released sweet photographs of Charlotte, ready for her first day.
They showed the fourth in line to the throne ready to go in her red coat and pale pink scarf, and matching pink backpack.
With Prince Harry and Meghan Markle's wedding just a couple of weeks away, Charlotte is already skilled at bridesmaid duties.
She took on the role when the Duchess of Cambridge's sister Pippa Middleton married hedge fund manager James Matthews in the village of Englefield in Berkshire last May.
Dressed in a cream dress tied with a dusky pink sash, Charlotte scattered confetti petals from a wicker basket and wore a headdress of white flowers.
Kate took charge of the bridesmaids and pageboys, including Prince George, and at one point had to tell the excited children to keep quiet.
Royal tour - and tantrum
Charlotte and George joined their parents on an official tour of Poland and Germany last summer.
The princess was pictured collecting posies, peering out of the windows of their plane with brother George - but also having a little tantrum on the tarmac.
The youngster sat down on the floor in protest, but was promptly scooped up, comforted and distracted by her mother Kate.
Trooping the Colour
It's a royal rite of passage for princes and princesses so Charlotte joined the Windsors on the Buckingham Palace balcony for the Trooping the Colour parade.
While George appeared to have had enough, resting his head on his hand as he stood on a little step on the red cloth decorated balcony, Charlotte seemed content during the annual event.
She happily watched the flypast, grinning as the military aircraft flew over the Queen's London home.