Pare, 29, showed off her incredible shape in a retro print triangle top and matching bikini bottoms; her character's ad exec love, 41, sported red swim trunks.
Mad Men fans are eager for even the littlest bit of info regarding what's in store for Don, Megan, Joan and the rest of the gang as the show enters its sixth season. So far, though, show runner Matthew Weiner insists on remaining tight-lipped -- even with his stars.
Vincent Kartheiser (who plays Pete Campbell) told Details mag recently that the cast is, for the most part, kept in the dark about the direction the show's headed.
"You never know which characters are or aren't going to come back, you never know where you're gonna be, you never know what year it's going to be," he explained. "We know as much as everyone else, which is absolutely nothing. And to be honest, I like it that way!"