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His Serene Highness Albert II, Prince of Monaco arrives to inaugurate The Princess Grace Rose Garden in St. Dominickâs Park, during a visit to Drogheda, County Louth. (Photo by Niall Carson/PA Images via Getty Images)

His Serene Highness Albert II, Prince of Monaco arrives to inaugurate The Princess Grace Rose Garden in St. Dominickâs Park, during a visit to Drogheda, County Louth. (Photo by Niall Carson/PA Images via Getty Images)

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His Serene Highness Albert II, Prince of Monaco arrives to inaugurate The Princess Grace Rose Garden in St. Dominickâs Park, during a visit to Drogheda, County Louth. (Photo by Niall Carson/PA Images via Getty Images)

His Serene Highness Albert II, Prince of Monaco arrives to inaugurate The Princess Grace Rose Garden in St. Dominickâs Park, during a visit to Drogheda, County Louth. (Photo by Niall Carson/PA Images via Getty Images)

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His Serene Highness Albert II, Prince of Monaco inaugurates The Princess Grace Rose Garden in St. Dominickâs Park, during a visit to Drogheda, County Louth. (Photo by Niall Carson/PA Images via Getty Images)

His Serene Highness Albert II, Prince of Monaco inaugurates The Princess Grace Rose Garden in St. Dominickâs Park, during a visit to Drogheda, County Louth. (Photo by Niall Carson/PA Images via Getty Images)