On his celebrated show Mad Men, he's Don Draper, a prolific advertising executive whose efforts as a father and husband leave a lot to be desired.

But on Thursday, Jon Hamm, 43, showed off his skills as a stealth photobomber while hanging out with his screen family January Jones, 36, and Kiernan Shipka, 15, at the AMC Holiday Party.

As the Mad Men mother-and-daughter duo took a snapshot at West Hollywood, California, eatery Dominick's, Jon placed himself in the background to strike a bug-eyed pose.

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Picture this! Jon Hamm was seen photobombing his Mad Men co-stars January Jones, left, and Kiernan Shipka, right, at the AMC Holiday Party at Craig's in West Hollywood, California, on Thursday

His screen ex-wife January, wearing a white jacket over a semi-sheer top, was completely unaware of the comedic distraction as she smiled with Kiernan, who was resplendent in a red dress.

Jon, who cut a dapper figure in a grey blazer over a midnight blue shirt, was seen mingling with stars from some of AMC's biggest hit shows, including Breaking Bad and The Walking Dead.

The final remaining episodes of Mad Men, which has won acclaim since its 2007 debut, are set to air in 2015.

The ex factor: Jon and January, who play ex-spouses Don and Betty on Mad Men, later posed together

Girls, uninterrupted: January, who plays Kiernan's mother on the show snapped a selfie of the pair

Promising an 'emotional' end, Jon recently told told 5 News: 'I know how it ends and I’m pleased with it. It’s an ending, and like a lot of endings it’s going to be emotional. As emotional hopefully for the viewers as it was for us. But we’ll see.'

The actor also quipped that if any viewers have a problem with how the series rounds up then the blame is to be placed solely upon writer Matthew Weiner.

He joked: 'I would imagine any people’s issues with it will fall on Matthew’s head rather than mine so I don’t necessarily worry about the reaction.'

Mingle: Jon chatted with Bob Odenkirk, who is set to star in Breaking Bad spin-off Better Call Saul

Living it up: He was also seen enjoying a moment with The Walking Dead's Chad L. Coleman

Jon revealed that unlike some of his co-stars he had not taken any props from the set as he said he wanted to keep his time on the hit series 'unsullied.

'I actually didn't [keep props]. I know that a lot of people did. I wanted it to be unsullied in a way, I just wanted to have my memories,’ he said.

'And I have very good memories working on that show. It will always be an incredibly important part of my life and my career.'

Speaking about the relationships he made while starring in the American period drama, he added: 'I've made some of the best friends of my life on that show, and that's cast and crew, and I'll always have those memories.'