The former Gossip Girl star took to hours after becoming a dad on Thursday (20Aug15) to share the exciting news, writing, "They're here! I've never been more in love than I am with the gift my beautiful wife just gave me... Zoe Madison and Blake Everleigh Zegers."

The arrival of the girls comes a month after the actor posted an online snap which fooled fans into thinking the babies had arrived.

The picture featured a medical machine showing a read-out of the babies' vital signs, and Zegers added the caption, "2 girls. In sync", leading fans to believe he had become a father.

He later cleared up the confusion and confirmed the babies were not due until August (15), close to his second wedding anniversary. Zegers wed Feld in August, 2013.