Even though Prince Albert and Mélanie-Antoinette Costello de Massy are related, they did not exactly grow up together. The reason for this is that Mélanie-Antoinette was born a whole generation after Albert. The gorgeous young aristocrat is technically Albert's second cousin — the daughter of his late first cousin, Elizabeth-Ann, Baroness of Massy. As a result, there is a 27-year age gap between Albert and the much younger Mélanie-Antoinette. 

Despite the generational differences at play, however, Albert's ties to Mélanie-Antoinette can be traced back to the affectionate relationship that he had with the younger aristocrat's mother. Prior to her death in 2020, Elizabeth-Ann was believed to have been quite close to Albert and his siblings. As reported by Hello!, the baroness was known to help Albert out with his royal duties.

Interestingly, Elizabeth-Ann also supported the House of Grimaldi in other ways. For one thing, the baroness was his younger sister, Princess Stéphanie's, godmother. And, for another, she had also been a bridesmaid in Prince Rainier's wedding to Grace Kelly. Because of Elizabeth-Ann's dedication to the crown, it is believed that she taught Mélanie-Antoinette how to advise Albert. And according to Gala, the younger aristocrat has continued her mother's work.