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Congratulations to Jessica Paré and John Kastner.

The Mad Men star, 34, and her musician beau welcomed their first child together – son Blues Anthony Paré Kastner – on Thursday, March 19, the couple announced via Instagram.

On Friday, the proud papa announced their son’s arrival with a sweet snapshot of big sister Summer Lee, 7, holding her baby brother.

This is the first child for the actress, who stars as Don Draper’s wife on the hit series. Summer is Kastner’s daughter from a previous relationship.

Be sure to catch the final seven episodes of Mad Men, airing April 5 on AMC.

Please meet Blues Anthony Paré Kastner…

A photo posted by johnkastner (@johnkastner) on Mar 20, 2015 at 8:47pm PDT

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