French client to the Bower agency, Marisa Berenson, isn't French at all: she is an American actress. Apparently born (in NYC) with a proverbial "silver spoon in her mouth", she went to prestigious schools where she learned a few languages, including French---which she pronounces flawlessly.
The romantic song that Tony and Marisa slow dance to plays the following lyrics: "la garce va jouer la farce". It literally translates to: "the bitch is going to play the farce".
Genevieve Pescher's English does not bear a French accent in the least, she speaks with a slight English lilt.