Caroline was born on 23 January 1957 in the Prince's Palace, Monaco. She is the eldest child of Rainier III, Prince of Monaco, and his wife, former American actress Grace Kelly. Christened Caroline Louise Marguerite, she belongs to the House of Grimaldi. She was the heiress presumptive from her birth to 14 March 1958, when her brother Prince Albert was born. On 1 February 1965, her younger sister Princess Stéphanie was born. Caroline is a legitimate patrilineal descendant of the Dukes of Polignac, and as such belongs to the historical French nobility. Through her mother, she is of Irish and German descent.