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 / Updated  / Source: TODAY
By Elizabeth Murray

It's a boy! Actress Jessica Paré, known to many as Megan Draper on "Mad Men," welcomed her first child with boyfriend John Kastner this week.

Kastner, a musician also from Paré's native Quebec, announced the news via Instagram on Friday with a photo of the newborn being held by his older half-sibling, Summer.

"Please meet Blues Anthony Paré Kastner…" he captioned the photo.

The actress' rep confirmed her pregnancy in October, and around the same time Kastner shared another photo of Blues' half-sister announcing baby news, this time with a T-shirt saying, "I'm going to be a big sister."

Paré and Kastner, who fronts Canadian punk band Axwell, have been dating for two years. The birth comes only two weeks before the final season of "Mad Men" premieres on April 5 on AMC.