October 28, 2014 06:36 PM

Charley Gallay/Getty

As her hit show comes to an end, Jessica Paré is getting ready for a new beginning: She’s pregnant!

The Mad Men star is expecting her first child with boyfriend John Kastner, her rep confirms to PEOPLE. 

The happy news apparently flew under the radar for a while: Last month, Kastner, a musician, posted an Instagram photo of him and Paré, 33, hugging as his 7-year-old daughter Summer Lee proudly wore a T-shirt reading “I’M GOING TO BE A BIG SISTER.”

The stars, who are both Canadian, began dating in May 2012.

— Michele Corriston with reporting by Mia McNiece

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