Michael Weatherly and his wife, Bojana, have welcomed a baby boy, the NCISstar announced on Tuesday.
"Beautiful Bojana gave birth to 10lb Liam Weatherly today, the most important day of the week," Weatherly tweeted before mentioning NCIS' Tuesday at 8/7c timeslot.
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Liam joins older sister, 18-month-old Olivia. Weatherly, 45, also has a 17-year-old son, August, with his first wife, The Young and the Restless' Amelia Heinle.
Weatherly and Bojana, an internist, married in September 2009.