Zou Bisou Bisou
I'm not very familiar with the yé-yé scene (I know who Françoise Hardy, France Gall and Sylvie Vartan are, but that's about it) but a little googling reveals that the original version of the song was sung in English by Sophia Loren, and then in French by Gillian Hills. Actually, after reading the wiki page, it's sorta confusing. I bet that page has gone through a ton of edits in the past few days since the premiere, so I'll leave you to figure it out for yourself if you're so inclined.
In any case, you can actually buy Jessica Paré's version of the song on iTunes or on 7" vinyl (b/w the Mad Men theme song). You can also see the clip from the show here.
Jessica Paré - Zou Bisou Bisou