For Princess Charlotte's first birthday past year, Kensington Palace released four pictures of the little girl.
Kate herself took this photo of Charlotte at their family home in Anmer Hall, in Norfolk.
Kensington Palace released a statement with the photo that said, "The Duke and Duchess are very pleased to share this photograph as they celebrate Princess Charlotte's second birthday".
She's wearing a gorgeous knitted cardigan with sheep on it.
The princess' hair is longer than when we last saw her at Christmas, and she's got a dark-blue clip keeping it tidy to the side.
Kensington Palace has shared a new birthday portrait of the toddler ahead of her birthday celebration.
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Princes Chrlotte poses for a photo in May past year.
Prince William and Kate released a picture of Prince George for his second birthday too, as he could be seen laughing in his father's arms. Last year, she won hearts across the globe when she joined her parents on their royal tour of Canada and spoke her first public words ("pop" no less) at a children's party.
She's going to be a bridesmaid for her aunt, Pippa Middleton, at her May 20 wedding.
The then 17-month-old Princess Charlotte attended the engagement with her family, which was held at the grounds of Government House in Victoria for military families and their offspring.
Does it feel like the little princess just grew up in an instant to you?
She was named Charlotte Elizabeth Diana in tribute to her grandmother Diana, Princess of Wales and her great-grandmother the Queen. They are set to move back to Kensington Palace in London in the fall when big brother Prince George, who turns 4 in July, starts pre-school.
After moving to London, Prince George will be schooled at the private Thomas's Battersea school, his sister, probably, will be sent to a nursery later this year.