- Children with Ernst August of Hanover: Alexandra Charlotte Ulrike Maryam Virginia, Duchess of Brunswick-Lüneburg, Royal Princess of Great Britain and Ireland (b. 20 July 1999). Alexandra is the only one of Caroline's children to bear a royal title.
- When Grace Kelly was scanning the royal houses of Europe for a suitor for Caroline, her favorite candidate became Prince Ernst August of Hanover. Ernst's impeccable breeding, Grace hoped, would be a stabilizing influence on her headstrong daughter. More than two decades and two marriages later, Caroline married him.
- Her official royal title is "Her Royal Highness Princess Caroline, The Princess of Hanover, Duchess of Brunswick-Lüneburg, Royal Princess of Great Britain and Ireland, and by birth Princess of Monaco".
- Her second husband Stefano Casiraghi died at 30, in speed boat accident.
- In 1983 was engaged to Roberto "Robertino" Rossellini, son of Roberto Rossellini and Ingrid Bergman.
- Her great-great-great-great grandmother was Yolande Martine Gabrielle de Polastron, duchesse de Polignac, who has been played by, among others, Rose Byrne, Claudia Cardinale, and Ruth Hussey.
- Daughter of Grace Kelly and Prince Rainier of Monaco.
- Older sister of Prince Albert of Monaco and Princess Stéphanie of Monaco.
- Children with Stefano Casiraghi: Andrea Albert Pierre (b. 8 June 1984), Charlotte Marie Pomeline (b. 3 August 1986), Pierre Rainier Stefano (b. 5 September 1987).
- After the death of her father, Prince Rainier of Monaco, on 6 April, 2005, her new title is "Her Royal Highness Princess Caroline, The Princess of Hanover, Duchess of Brunswick-Lüneburg, Royal Princess of Great Britain and Ireland, Marquise of Baux, and by birth Her Serene Highness the Hereditary Princess of Monaco." Along with her youngest daughter, HRH Princess Alexandra, she outranks her father, brother, and sister in the ranking of royalty since HRH (His/Her Royal Highness) ranks above HSH (His/Her Serene Highness).
- Sister-in-law of Heinrich von Hannover and Princess Charlene of Monaco.
- Her husband Ernst August of Hanover is an uncle of Albert Thilo Ludwig Arndt, Prince of Hanover (b. 1999), Eugenia, Princess of Hanover (b. 2001) and Oscar Julius Heinrich Ferdinand Nick (b. 1996).
- Obtained a judgment from the European Court of Human Rights condemning Germany for not respecting her right to a private life, following publications of photographs depicting the Princess in her daily life (24 June 2004).
- Due to her engagement for children in danger, she was awarded the UNICEF Children's Champions Award (2006).
- Speaks French, English, German, Spanish and Italian.
- Has a degree in philosophy, psychology and biology from the Sorbonne.
- The church marriage with Junot was annulled by the Vatican in 1992.
- Best friends with Karl Lagerfeld, Inès de la Fressange, Jean-Christophe Maillot, Marco Balestri, Antonio Varenna, Hélène Boitel and Marina Palma.
- Aunt of Jazmin Grace Grimaldi & Alexandre Coste.
- Separated from Ernst August summer 2009.
- Her son Andrea became father to a boy, Alexandre born in London on 21 March 2013 and a daughter, India born in London on 12 April 2015.
- Her daughter Charlotte became mother to a boy, Raphael born in Monaco on 17 December 2013.
- Prince Ernst August of Hanover is a cousin of Queen Elizabeth (her 7th great-grandfather, Georg, Kurfürst von Hannover, was crowned George I of Great Britain in 1714). Queen Elizabeth issued a Declaration in Council in 1999, granting Ernst permission to marry Caroline, pursuant to the British Royal Marriages Act 1772. Without the Royal Assent, the marriage would have been void in Britain where Ernst's family owns property, and his lawful descendants remain in succession to both the British crown and the suspended peerages of the Dukedom of Cumberland and Teviotdale, and the Earldom of Armagh. In order for Caroline to retain her claim to the throne of Monaco and to transmit succession rights to future offspring, she and Ernst were obliged to obtain the approval of France, as per the since-defunct Franco-Monegasque Treaty of 1918, and of her father, in his capacity as the sovereign of Monaco.
- Had relationship with Guillermo Vilas in early 80s.
- Andrea, Charlotte and Pierre were born in Monaco and Alexandra in Vöcklabruck, Austria.
- After Stefano Casiraghi's death, Caroline had relationship with actor Vincent Lindon.
- Her son, Pierre became father to a son, Stefano in Monaco on 28 February 2017.
- Lost her hair 1996.
- She was twice the heir presumptive to the throne of Monaco, but was displaced both times by the birth of a more eligible heir. She was born as the heir presumptive to her father Rainier III, but was displaced by the birth of her brother Albert the following year, who became heir apparent. After their father's death, Albert became Prince of Monaco, but as he had no legitimate children Caroline was next in line for the throne. She was displaced again after Albert and his wife Charlene had twins in 2014, and his son Jacques became heir apparent.
- Espartaco Santoni claimed in his memoirs that he'd been in relationship with both Caroline and her sister, Stéphanie of Monaco.
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