Charlotte Casiraghi in Yellow Gucci Is a Match Made in Fashion-Girl Heaven

You can be fairly sure that when real-life royalty decides to hit the town, it's for a high-fashion event. And such was the case on Tuesday night in New York City, when Monegasque royal Charlotte Casiraghi attended the 110th anniversary party for the German brand Montblanc.

Charlotte has had a long relationship with Montblanc; she's an ambassador who appears in ads. And at the bash, she posed alongside fellow ambassador Hugh Jackman as well as the company's chief executive, Jérome Lambert.

Dressed in a yellow brocade gown from Gucci, Charlotte proved once again why she's one of the world's most stylish royals. Charlotte also displayed her knack for a red carpet flourish by finishing her look with plenty of diamonds, found on both her necklace and earrings. She kept her hair simple, wearing it down with a slight curl.

Charlotte was one of the many women who dressed to the nines for the big Montblanc birthday party. Kate Bosworth, who selected a stunning Dior gown, was there along with Olivia Palermo and models Sara Sampaio and Emily DiDonato.