Daniela Ruah

NCIS: LA star Daniela Ruah has welcomed a baby boy, People reports.

River Isaac Ruah Olsen was born on Monday, Dec. 30. "He's healthy and strong, which is all we could ask for," the new mom told the magazine. "We are so happy, so thankful and feel so blessed to have brought him into the world."

See who else had babies this year

Ruah, 30, is engaged to David Olsen, the brother of her co-star (and on-screen love interest) Eric Christian Olsen. The pair revealed that they were engaged and expecting in September. Olsen, a former Navy SEAL, acts as Eric's stunt double.