Her Royal Highness Princess Caroline, Princess of Hanover (Caroline Louise Marguerite Grimaldi, born 23 January 1957), styled Her Serene Highness The Hereditary Princess in Monaco and HRH The Princess of Hanover elsewhere¹, is the eldest child of Prince Rainier III of Monaco and his wife, Grace Kelly. She is the second wife of Prince Ernst August of Hanover and, since her father's death on April 6, 2005, has been heir presumptive to the throne of Monaco.

The Princess of Hanover has one sister, Princess Stéphanie of Monaco.

First marriage

Princess Caroline's first husband was Philippe Junot (1940-), a Parisian banker. They were married on June 29, 1978 and divorced in 1980, a period of time that had been predicted by the bride's mother, who disapproved of Junot's age and his reputation as a playboy. In 1992, the Roman Catholic Church granted the princess an annullment.

Second marriage

Her second husband was Stefano Casiraghi (1960-1990), the sportsman heir to an Italian oil fortune who died in a boating accident. They were married on December 29, 1983, and had three children: Andrea Albert Pierre Casiraghi, Charlotte Marie Pomeline Casiraghi, and Pierre Rainier Stefano Casiraghi. The two younger children are named for their maternal great-grandparents, Princess Charlotte of Monaco and Prince Pierre of Monaco whilst Andrea was named for a childhood friend of his father's.

Princess Caroline had a liaison from 1990 until 1995 with French actor Vincent Lindon.

Third marriage

Her third and present husband is Prince Ernst August of Hanover, the head of the House of Hanover, who would be King of Hanover if the country still existed. They married in 1999, after his divorce from the former Chantal Hochuli , and have one child, Princess Alexandra of Hanover, who was born six months later.

On June 24, 2004, Princess Caroline obtained a judgment from the European Court of Human Rights condemning Germany for non-respect of her right to a private life. The seven judges who examined her request ruled that German jurisdictions have misunderstood this right by refusing to forbid publication of photographs depicting Caroline in scenes of her daily life.

Succession issues

The succession of Monaco has become a matter of concern recently given that Caroline's brother, Prince Albert apparently has no children. (An American woman, however, has insisted that Albert is the father of her daughter, born in 1992, a claim that has not yet been substantiated.) On April 2, 2002, Monaco passed Princely Law 1.249 which provides that if Prince Albert assumes the throne and then dies without a legitimate direct heir, the throne would pass to his siblings and their descendants under the rule of male-preference primogeniture. Before this change, the crown of Monaco could only pass to a direct descendant of the reigning prince, and Caroline would have become ineligible to inherit the throne upon Albert's ascension.

Due to the fact that her brother remains unmarried and has no known or acknowledged children, it is possible that Caroline will one day become the second Sovereign Princess in Monaco's history. Her ancestor Louise-Hippolyte Grimaldi held that title for a few months in 1731.

Titles from birth to present

• Her Serene Highness The Princess Caroline of Monaco (1957-1999)
• Her Royal Highness, The Princess of Hanover , Duchess of Brunswick and Lüneburg , Royal Princess of Great Britain and Ireland (1999-Present)
• Her Serene Highness the Hereditary Princess of Monaco (2005-Present)

Caroline adopted her present title, which outranks her title as a Princess of Monaco; however, among her styles, only Princess of Hanover is actually in common use in media reports and official Monaco palace press releases. Though the Hanover family titles are legally defunct as per German law, the title of HRH the Princess of Hanover is officially recognized in Monaco and used as courtesy elsewhere. None of the titles has been legally recognized since the end of World War I by any of the countries that once granted them (United Kingdom, Germany, and Ireland).

Her title in German is Caroline Prinzessin von Hannover.

|- style="text-align: center;" | width="30%" |Preceded by:
Albert II | width="40%" style="text-align: center;" |Hereditary Princess of Monaco
2005 – Present | width="30%" |Succeeded by:
Current Incumbent