WENN.com

The aristocratic grandson of screen-legend Grace Kelly turned Princess is set to become a first-time father.

Andrea Casiraghi, who is the son of Kelly’s oldest daughter Caroline, Princess of Hanover, and the second to the Monegasque throne, is preparing to welcome a child with Columbian heiress and socialite Tatiana Santo Domingo.

The couple became engaged in July and plan on getting married next year.

Earlier n the year, his younger brother Pierre made major U.S. headlines when he got into a booze-fueled brawl at NY’s Double Seven nightclub that landed him in the hospital.

Princess Caroline’s sister Princess Stéphanie of Monaco, Countess of Polignac, is godmother to Andrea.

Pictured: The young couple over 5 overs ago at the annual charity soccer match in preparation of the 64th Formula 1 Grand Prix of Monaco.