There is officially a new member of the NCIS: Los Angeles family.

Daniela Ruah, who stars as Kensi Blye in the hit CBS drama, has given birth to a little baby boy with fiancé David Olsen, People announced on Sunday. Named River Isaac, the actress's first child was born on Dec. 30.

"He's healthy and strong, which is all we could ask for," Ruah told People. "We are so happy, so thankful and feel so blessed to have brought him into the world."

The new mother took to Twitter on Sunday night to share the happy occasion with her followers.

"Heaven, I'm in heaven... And my heart beats so that I can hardly speak #mytwoloves," the 30-year-old mother wrote alongside a photo of River's fingers clutching his father's hand.

Ruah and Olsen - who is the real-life older brother (and stunt double) of NCIS: LA's Deeks (Eric Christian Olsen) - announced their engagement and pregnancy back in September. The new family's latest addition comes just months after the August arrival of Eric Olsen and Sarah Wright's first child, Wyatt Oliver Olsen.

'These kids are going to be probably in the same grade together so there's going to be two Olsen's just ruining things all over Los Angeles," Eric Olsen omg! Insider in October as he anticipated adding being uncle to his list of duties.

Ruah, David Olsen, and Eric Olsen can all be seen Tuesdays at 9 p.m. ET on CBS during NCIS: LA.

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NCIS: LA, NCIS: Los Angeles, Celebrities, Celebrity babies, CBS, Television