Princess Eugenie is ringing in Sarah Ferguson's birthday with an Instagram tribute of new photos of her in grandmother mode. Princess Eugenie is mom to sons August and Ernest with husband Jack Brooksbank.

Princess Eugenie and her sister, Princess Beatrice, have both kept their kids out of the royal spotlight, but on Tuesday, Oct. 15, Eugenie shared some rare photos of her youngest son, Ernest, to mark a milestone birthday for mom Sarah Ferguson, the Duchess of York.

Princess Eugenie celebrated her mom today with a loving tribute on Instagram that included candid family photos. In her post, timed to Sarah Ferguson’s 65th birthday, Eugenie shared snaps of the Duchess of York in full grandma mode,

While Princess Eugenie has traditionally kept her kids under the royal radar, the mom-of-two has slowly started sharing more of her young sons, Prince August and Prince Ernest, over the past few months.

In one image, Fergie is seen squatting down to hold Ernest’s tiny hands while in a green garden—seemingly inside Eugenie and Jack’s estate. The duchess wears a light blue denim jacket and maxi skirt, with a teal scrunchie holding up her ponytail, and Ernest matches her in a light sweatshirt, blue jeans, and white-and-blue sneakers.

In a touching Instagram tribute, Princess Eugenie celebrates her mother, Sarah Ferguson's 65th birthday with unseen family photos and heartfelt messages. The Duchess of York's grandeur as a grandmother,