Don Draper himself tells us what's to come at Sterling Cooper

If you have any questions about Mad Men's upcoming seasons, just ask Jon Hamm. He often seems more-than-willing to let the cat out of the bag.

Hamm, who plays Don Draper on the Emmy-winning AMC drama, casually revealed in January that the long-awaited fifth season will start on March 25, and now he's given viewers some clues as to what to expect story-wise.

While attending the BAFTA awards in London, Hamm was asked why the promiscuous Draper never had a fling with buxom secrety Joan Holloway Harris, played by Christina Hendricks. “Who says he hasn’t?” Hamm responded, hinting at a past affair that might soon come to light.

Hamm didn't stop there, according to Vulture. “The Don-Joan dynamic is something that we do explore, and don't take this the wrong way, but we do explore as the show goes on," he said. "They have worked together for a long time, they know one another very well and I'll leave it at that."

No worries, Hamm. Our cup runneth over.

You might also like:

When Is 'Mad Men' Back On? Jon Hamm Dishes

'Mad Men' Season Five To Premiere in 2012

Mad Men's January Jones Is Expecting First Child

'Mad Men' And 'Mildred Pierce' Lead Emmy Nominations