Daniela Ruah is going to be a mom again!
The NCIS: Los Angeles star, 32, announced her pregnancy on Monday in a sweet Instagram post, showing off her burgeoning baby bump.
NEWS: 'NCIS' Star Daniela Ruah Expecting First Child
"There are four people in this photo, can you spot them all?" she wrote as the caption.
In the pic, Daniela, her husband, David Olsen, and their two-year-old son, River Isaac, are seen exercising in a yard.
The post also features a quote from the late astronomer Carl Sagan: "For small creatures such as we, the vastness is bearable only through love."
David is the older brother to Daniela's NCIS: Los Angeles co-star, Eric Christian Olsen. Coincidentally, Eric is expecting his second child, a baby girl, with wife Sarah Wright Olsen this year.
ET caught up with Daniela and Eric in the fall, getting their take on their characters' (Kensi Blye and Marty Deeks) relationship on the show.
WATCH: 'NCIS: LA' Stars Eric Christian Olsen and Daniela Ruah on Densi
"This is a great example of real flawed human characters that are just trying to put the pieces together," Eric said of the fans' investment in the two. "As far as them both being incredibly independent but then finding someone who makes sense for them that understands that journey... It's really fun to watch these two creatures build a relationship together."
"There's a mutual understanding of certain emotions," Daniela adds. "They're both kind of broken because of certain things and I think they're helping each other fix themselves."