Joan Yarde-Buller
The Viscountess Camrose | |
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| Full name | Joan Barbara Yarde-Buller |
| Born | 22 April 1908 |
| Died | 25 April 1997 (aged 89) |
| Spouses | |
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| Father | John Yarde-Buller, 3rd Baron Churston |
| Mother | Denise Orme |
Joan Barbara Berry, Viscountess Camrose (née Yarde-Buller; 22 April 1908 – 25 April 1997), also known as Joan Guinness and Princess Taj-ud-dawlah Aga Khan, was an English socialite who was one of the Bright Young Things.