The singer, 55, was one of several performers who took to the stage at the Stephen Sondheim Theatre to celebrate songwriter John Kander's 98th birthday.
The 36-year-old actress has been making the most of the festivities in the French capital in the last week, but seemingly saved her most racy look until last.
The Love Island star, 34, recently split from TOWIE 's Pete Wicks and showed him just what he was missing as she arrived on the red carpet in a completely sheer black gown.