Jensen Ackles and Danneel Harris welcomed daughter Justice Jay on May 30. Credit: Steve Granitz/

It's a girl for Jensen Ackles and Danneel Harris! The Supernatural star, 35, and the One Tree Hill alum, 34, welcomed their first child late last month. "We are happy to announce the birth of our precious baby girl, Justice Jay 'JJ' Ackles," Harris tweeted June 6. "She was born happy and healthy on May 30."

The couple were last seen attending UCLA's Spring Sing event on May 18, where Ackles served as a celebrity judge during the student talent competition. Harris announced her pregnancy in January just before the People's Choice Awards.

The new parents met as costars in the 2007 movie Ten Inch Hero. Ackles proposed in 2009 and the pair tied the knot the following year in the actor's hometown of Dallas, Texas.

Supernatural will return for a ninth season Tuesdays this fall on The CW. Harris recently guest starred on ABC's How to Live with Your Parents (For the Rest of Your Life).