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Jensen Ackles, Danneel Harris

One Tree Hill star Danneel Harris' family tree is growing!

The 34-year-old actress and her hubby, Supernatural star Jensen Ackles, 35, are now first-time parents: The hubby-and-wife duo have welcomed a baby girl.

The happy mama shared the ecsstatic news on Twitter Thursday, where she also revealed their bundle of joy's judiciously unique name.

"We are happy to announce the birth of our precious baby girl, Justice Jay 'JJ' Ackles. She was born happy and healthy on May 30th," Harris wrote.

The couple announced in January that they were on the baby way, and a few days later, Harris debuted her baby bump on the red carpet at the People's Choice Awards.

The duo tied the knot in May 2010.

Congrats to the first-time parents!