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Prince Rainer and Princess Grace pose with the bridal couple ahead of the Wedding Ball of Princess Caroline (wearing Princess Grace’s Diamond Tiara) and Philippe Junot at the Prince’s Palace of Monaco in Monte Carlo on this day in 1978. Other guests included Queen Anne of Romania (in her Danish Sapphire Parure), the Aga Khan and Begum Salimah Aga Khan (wearing her Emerald Suite), and Hollywood stars Ava Gardner, Cary Grant and Frank Sinatra. The couple divorced in 1980, and the Princess has remarried twice.

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