Au Pairs series by Melissa de la Cruz

Now, I read these books a couple summers ago so I can't get you a very good synopsis, but I remember absolutely loving them. It's about 3 or 4 girls (I can't remember, sorry!) that get summer jobs as nannies for a family in the Hamptons. Each book is a different summer, but they all involve the same people. Good Reads! I'm fairly certain the order is Au Pairs, Sun Kissed, Skinny Dipping, and then Crazy Hot, but double check. :)