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OTRC: Alex O'Loughlin of 'Hawaii Five-0,' Malia Jones welcome baby boy

Alex O'Loughlin appears in a promotional photo for the CBS series 'Hawaii Five-0.' (CBS)

Alex O'Loughlin of "Hawaii Five-0" and his girlfriend Malia Jones have welcomed their first child together - a baby boy, the actor's rep told OTRC.com.

Jones, a 35-year-old surfer and model, gave birth on Thursday. The child's name was not revealed. She and O'Loughlin, 36, took their relationship public in January. Both have children from previous relationships. O'Loughlin is a father to a 15-year-old son named Saxon. Jones has a 3-year-old son named Spike.

The actor, who is originally from Australia, plays Steve McGarrett on CBS' TV reboot of "Hawaii Five-0." Malia, who has been photographed for magazines such as Sports Illustrated's Swimsuit Edition, Maxim and Esquire, was raised in Hawaii.

She told ESPN she comes from a family of surfers and won the U.S. Amateur Championship when she was 15. She also said she worked as a consultant for Disney's 2002 animated film "Lilo and Stitch," which is set in Hawaii and features many surfing sequences.