AceShowbiz -

Jessica Pare, 34, can now officially add mother to her resume. The "Mad Men" actress has given birth to a bouncing baby boy. It's her first child with her musician boyfriend John Kastner. The proud daddy introduced the newborn on Instagram.

"Please meet Blues Anthony Pare Kastner...," Kastner captioned the picture. The baby bundled up in a blanket was seen being held by his equally-adorable big sister Summer Lee, Kastner's 8-year-old daughter whom he shares with former wife Nicole de Boer.

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

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Jessica Pare who played Megan Draper on the AMC series started dating fellow Canadian John Kastner since around 2012. She announced she's expecting their child in October 2014. She was previously married to writer and producer Joseph M. Smith. They have no children together.