"between him and Yves Montard while I lusted after Simone Signoret"

Simone Signoret (1921-1985) was the first French actress to win an Academy Award and her lusty looks saw her portray prostitutes quite often in her films. 

Simone's regular visits to the Café de Flore meant she met and mingled with many artistes and writers...as suggested here by William Boyd.