Monaco's cutest twins revealed a birthday that was both a Taylor Swift fan moment and palace perfection. Princess Charlene and Prince Albert's children, Princess Gabriella and Prince Jacques, officially turned one year old, and the palace shared a sweet Instagram Reel to mark the moment.

The twins, who celebrated their 10th birthday on December 10, wrote: “Happy birthday to Prince Jack and Princess Gabriella! 🎂 Their Royal Highnesses celebrate their 10th birthday today.”

Jacques and Gabriella, heirs to the throne of Monaco, rocked everything from casual looks to the royal finest in the reel, but one particular photo stood out. Dressed in suits and flawless pastel pink coats, the twins posed in front of the fountain with their arms raised, making a heart hand.

Charlene and Albert's children clearly took note of Taylor Swift's iconic hand gesture. Prince George and Prince Charlotte took a selfie with Taylor Swift at the Elas Tour in London over the summer.

Aside from the Swiffey moment, the twins sported their best regal looks when they attended Monaco's National Day last month. Gabriella coordinated with her mom in a lilac coat dress, while Jack wore a mini-me version of his dad's military uniform.

The twins also showed their playful side in a photo, posing on what appeared to be a riding lawn mower while coordinating a denim shirt, jeans, and sneakers. Little Jack looked just like his royal mama in another photo, wearing a tan bomber jacket and sunglasses.

“Best regards! ❤️ They are so beautiful, with so much love in their eyes. May all your wishes come true,” one fan commented to Reel, while another royal watcher wrote, ”Happy birthday to the lovely twins. I love that they are each other's best friends. May there be nothing but smiles and laughter. 🎁🎂❤️💖.”

In recent weeks, Princess Gabriella and Prince Jack have made several appearances, including attending a Christmas lights event on November 30 and appearing on the family's ultra-casual holiday card released on December 2. Expect to see more festivities from this royal duo.