updated 06/24/2011 AT 10:00 AM ET
•originally published 07/26/2011 AT 5:05 PM ET
It’s a boy for Selma Blair!
The actress, 39, and her fashion designer boyfriend, Jason Bleick, welcomed son Arthur Saint Bleick on Monday, her rep tells PEOPLE exclusively.
Arthur weighed in at 7 lbs., 12 oz.
The couple, who met when collaborating on Bleick’s line EVER, announced her pregnancy in January. Blair chose to keep the sex of her baby under wraps until the delivery.