The actress’ rep confirmed the news to People.
Blair, 38, and Bleick, founder and artistic director of the line EVER, met while working together. They have been dating for about a year.
“They are ecstatic. They couldn’t be happier,” the source added.
Blair was previously married to Ahmet Zappa, musician, writer and actor whose father was the late Frank Zappa. That union ended in 2008. She then dated Mikey Dayfrom, her co-star in the series “Kath and Kim” from 2008 to 2010.