Jon Hamm, who plays advertising executive Don Draper on AMC's Mad Men, will portray a new love interest of Tina Fey's character Liz Lemon on 30 Rock.
He'll play a doctor who lives in her apartment building.
Could it last - and for how long?
"I just finished a couple of episodes, and I'll go back in the new year and do another one of those, and then we'll see what happens," Hamm said Tuesday at a benefit for the UCLA School of Theater, Film and Television.
This could result in some funny 30 Rock quotes. But then again, that could be said of all the main cast members and people who guest star on the show!