Sweden's Royal Palace is celebrating Estelle's fourth birthday by releasing two new photographs of the high-spirited young royal.
Taken at Haga Palace – the royal family home – the pictures show the princess with her adoring parents, Crown Princess Victoria and Prince Daniel.
Estelle, who sported a pale pink dress with sheer sleeves and blue pipping, also posed for an adorable solo portrait.
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Admiring well-wishers left greetings via the court's official website and on social media to celebrate Estelle's happy day.
The Royal Court / Sweden
Congratulations also came from Aunt Madeleine and her daughter Princess Leonore, who just celebrated her second birthday on February 20.
"Cousins are friends that will love you forever," Princess Madeleine captioned the sweet photo on Facebook. "Happy birthday dear Estelle! From your cousin Leonore."
And, to cap her last birthday as an only child, Princess Estelle is front and center on a new stamp, which will be released on March 17.
Its defining image, taken inside the Royal Palace's inner courtyard, shows her standing between her proud grandfather King Carl XVI Gustaf, and her mom, the heir apparent, Princess Victoria. Estelle, the third in line to the Swedish throne, wears a shimmering dress in the photograph.
But perhaps the best present of all will be the little baby brother or sister that her mom is set to deliver any minute – although Princess Victoria has previously confided that birthday girl would probably prefer a hamster!