Princess Caroline of Monaco to Be a Grandmother

Tatiana Santa Domingo and Andrea Casiraghi

Eric Ryan/Getty

updated 11/08/2012 AT 9:00 AM ET

originally published 11/08/2012 AT 9:30 AM ET

The tiny principality of Monaco is about to get a little bit bigger: Princess Caroline is going to be a grandmother.

Tatiana Santo Domingo, since July the fiancée of Caroline’s eldest son, Andrea Casiraghi, is expecting a child, say local news reports.

“I am expecting a child,” the Colombia-born heiress said Tuesday in Madrid while attending the Telva Fashion Awards, reports the Spanish newspaper La Voz Libre. “Yes, I am pregnant.”

The couple, both 28, have set a 2013 date for their wedding, according to Palace officials.

They met through mutual friends at the American University in Paris and have been dating for seven years. Casiraghi, is the first of the late Princess Grace’s grandchildren to be set to wed.

Casiraghi is the eldest of Caroline’s four children (his father is the late Stefano Casiraghi, who died in a speedboat crash in 1990) and follows his uncle Prince Albert II of Monaco in the line of succession to the Monaco throne, until Albert and his wife Charlene produce an heir.

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