NCIS star Michael Weatherly and his wife Bojana Jankovic welcomed a son named Liam on Tuesday.

"Beautiful Bojana gave birth to 10 lb. Liam today, the most important day of the week (NCIS Tuesday 8pm CBS)," he tweeted.

The couple, who married in 2009, announced the pregnancy in April. The actor and his wife, a doctor of internal medicine, also have an 18-month daughter, Olivia. The couple also owns two German Shepherds named Oriana and Quantum.

The actor spoke to Us Weekly in April and explained how he and his wife were deciding upon a name for the family's new addition.

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"There are many names being discussed. Some are very controversial. We have some Serbian names and some Irish names. Her heritage is Serbian, mine is Irish," he told the publication. "I thought that it might be fun."

Weatherly also a 17-year-old son named August from his previous marriage to actress Amelia Heinle. They divorced in 1997 after two years of marriage. He was also previously engaged to his Dark Angel co-star Jessica Alba, but they ended their relationship after two years.

The 45-year-old has played Anthony DiNozzo on NCIS since the CBS hit show premiered in 2003. This season, his character has dealt with the emotional departure of his co-worker and love interest, Ziva David.

Scroll through our gallery to see photos of Weatherly and his family.