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UPDATED THURSDAY July 26, 2007 7:15 p.m. EDT

As Life & Style first reported, Naomi Watts delivered a healthy baby in Los Angeles -- and now her rep has confirmed that she had a baby boy!

According to her rep, Naomi and her longtime love Liev Schreiber named the tot Alexander Pete Schreiber. He weighed in at 8 lbs., 4 oz., and measured 22 1/2 inches.

The arrival, which her rep said was at 3:59 p.m. on July 25, was slightly ahead of schedule. According to an insider, "Naomi was planning on giving birth next week-- her due date was early August -- but since she insisted on delivering naturally, she knew there was a chance she would have the baby before the due date. That's what wound up happening."

The insider says mother, child and the baby's father are resting comfortably at a hospital near Naomi's Brentwood, Calif., estate.

Says the insider: "This is a dream come true for both of them and they've done everything in their power to make it as special as possible, right down to staying in the dark about the baby's sex right up until Naomi gave birth."

Pick up Life & Style next week for more exclusive details!