The Supernatural star took to Instagram on Saturday to share the special news with fans, along with the twins' unique names: Zeppelin Bram and Arrow Rhodes.
"Danneel, JJ and I are excited to announce the birth of our twins Zeppelin Bram and Arrow Rhodes. They were born early yesterday morning. Everyone is doing great!" Ackles captioned a snap of Dr. Seuss' Thing 1 and Thing 2, adding the hashtag, "#twinning."