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January Jones, Kiernan Shipka, Jon Hamm, Photobomb

John Shearer/Invision for AMC/AP Images

This would be so creepy if that weren't Jon Hamm back there.

January Jones and Kiernan Shipka were posing for a festive photo op at the AMC holiday party held last night at West Hollywood restaurant Dominick's when their Mad Men co-star snuck up behind them and shot the camera an intentionally crazed look.

But it's nice to see the Draper family principals all together, right? (Are we the only ones hoping for an eleventh-hour Don-Betty reunion? Hmm, well, rooting for dysfunctional TV couples to succeed is another story...)

Hamm, of course, is an expert photobomber, having once joined Jimmy Fallon on the roof of 30 Rockefeller Plaza for one of our favorite Tonight Show bits, in which the instantly recognizable stars crashed tourist photo after tourist photo, the lucky visitors supposedly not even knowing what was going on until the stars revealed themselves.

Could you imagine visiting New York for the first time, going through your pics later that night at your hotel and seeing Hamm staring confusedly back at you? Concrete jungle where dreams are made of, indeed.

Meanwhile, the second half of Mad Men's seventh and final season is supposed to premiere on AMC sometime this spring, though the network has not officially announced the series' return date yet.