by Melissa de La Cruz

Third time's the charm as Mara, Eliza, and Jacqui head back to the Hamptons. This summer the au pairs are doing it right: in style, in step, and 'in' everywhere.

Mara has the VIP hookup at all the new clubs -- not to mention sweet digs living with bf Ryan on his parents' yacht. Eliza's nights are steaming too, since she and Jeremy are in total relationship bliss. Too bad she's spending her days at a fashion internship where the hot new designer goes all Devil Wears Prada on her. Jacqui is newly single, and on the prowl, with three boy millionaires next door competing for her affections.

The girls seem to have the whole package this summer. But looks -- as all good Hamptons girls know -- can be very deceiving....