"Supernatural" star Jensen Ackles and his wife, Danneel Harris, a soap opera star, have welcomed twins.

The actor announced the news on social media, while also sharing the unique names he and his wife gave them. The pair are already parents of 3-year-old daughter, JJ.

"Danneel, JJ and I are excited to announce the birth of our twins Zeppelin Bram and Arrow Rhodes," he captioned a pic of Thing 1 and Thing 2 from Dr. Seuss' "Cat In The Hat," posted on Dec. 3 "They were born early yesterday morning. Everyone is doing great! #twinning."

Danneel is mainly known for her role in "One Life To Live," but she also starred in "One Tree Hill."

In August, he announced the couple's pregnancy news.

"Adding a couple of pairs of boots to the family later this year. #crazytimesahead," the "Smallville" alum captioned the image of the blue and pink baby cowboy boots.

Adding a couple of pairs of boots to the family later this year. #crazytimesahead

A post shared by Jensen Ackles (@jensenackles) on

Jensen and Danneel married in 2010 after knowing each other for 10 years.

The actor is much more active on social media than his wife and often shares images of them with their daughter.

On Father's Day in June, he shared a snap of his daughter applying makeup to him.

"A fathers work is never done. Happy Daddy Day to all you men out there that handle your business. Even getting makeup applied. That's the good stuff... #fathersday," he said.

Perhaps there's something in the water on the set of "Supernatural." Last month, Jensen's co-stars Jared Padalecki and his wife, Genevieve Cortese, announced they are expecting their third child together.

Jared and Genevieve met on the set of the show when she had a recurring role during the fourth season. They married in 2010.