Jensen Ackles and Danneel Harris celebrate the 200th episode of 'Supernatural' in 2014. Credit: Andrew Chin/Getty Images

Full house! Jensen Ackles and his wife, actress Danneel Harris, have welcomed twins, a son and daughter, who were born on Friday, December 2.

The actor announced the news and shared the babies' unique names in a cute Instagram post on Saturday.

"Danneel, JJ and I are excited to announce the birth of our twins Zeppelin Bram and Arrow Rhodes," Ackles, 38, captioned a pic of Thing 1 and Thing 2 from Dr. Seuss’ Cat In The Hat. "They were born early yesterday morning. Everyone is doing great! #twinning."

Us Weekly confirmed in August that Ackles and the One Tree Hill alum, 37, were expanding their family. The pair are already parents of 3-year-old daughter JJ.

Ackles and Harris married at the Crescent Court Hotel in Dallas in May 2010 after knowing each other for 10 years.

Ackles and Harris' little ones will have plenty of playmates on set. Ackles' BFF and Supernatural costar Jared Padalecki is also about to become a father for the third time. Last month, the Gilmore Girls star, 34, announced that his wife, Genevieve Cortese, is pregnant and due in March. The couple are already parents of sons Thomas, 4, and Shepherd, 2.

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