The masked singer, 37, stunned onlookers as she wore a sheer, corseted black gown with thigh-high split at the bash to celebrate the 10th anniversary of top London nightspot Chiltern Firehouse.
Like many guests, she donned a Venetian-style mask to fit in with the party theme.
However, Princess Beatrice, 36, opted for a more conservative look.
She had announced she was pregnant with her second child the previous day.
Clutching a silver mask, the late Queen's granddaughter wore a classic black velvet jacket and wide-legged slacks.
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