Princess Charlotte (opens in new tab) celebrates her sixth birthday today, and for royal fans that means a new birthday photo of Prince William and Kate Middleton's (opens in new tab) only daughter.

Kensington Palace released a new birthday photo taken by Charlotte's mother, Kate, on Saturday afternoon ahead of Charlotte's birthday. According to a release from the Palace, the photo was taken by Kate this weekend in Norfolk. This suggests that the Cambridge family is celebrating Charlotte's birthday (opens in new tab) at Anmer Hall at Sandringham Manor.

In the new photos, Charlotte is wearing a pretty blue floral dress and her long blonde hair is down in a side part. The young royal looks very mature, but royal fans also quickly noticed that she is beginning to resemble older members of the royal family more and more.

Specifically, many have compared Charlotte's look in the new photos to that of her great-grandmother, Queen Elizabeth II (opens in new tab), and her father, Prince William (opens in new tab), when they were younger. For reference, this is a photo from 1939, when the Queen was 9 years old, a few years older than Charlotte is today:

and this is a photo from 1932, when she was 6 years old, the same age as Princess Charlotte. This photo was taken in 1992, and young Will's mischievous eyes have the same sparkle as Charlotte's.