The girls wrestle with the onslaught of 20-something girls when they are invited to a beach party in the Hamptons. Charlotte suffers a nasty punishment for passively lying about her age: her even younger toy-boy Greg gives her crabs. Sam fires her assistant Nina, only to find she is hosting the A-list party in the Hamptons using Sam's contact list. Carrie has an eager young writing admirer in Laurel and a bigger admirer in doctor Bradley Meego. Her weekend is ruined, however, when she finds Mr. Big there, back from Paris, with a new 20-something girlfriend, Natasha.