There’s a baby boom happening on the set of NCIS: Los Angeles!  One month after Eric Olsen announced he and his wife are expecting their second child, his co-star (and sister-in-law) Daniela Ruah has shared that she, too, is pregnant!

Ruah made the announcement by sharing a photo of herself working out with her husband and son. The caption read:  “There are 4 people in this photo, can you spot them all?  #AnotherRuahOlsenontheway #addingtothefamily #AutumnBaby #feelinggrateful”

Ruah and her husband, David Olsen, are already parents to a 2 year old son, River Isaac Ruah Olsen.  David is the older brother of Eric, who plays a love interest to Daniela’s character, and serves as his stunt double on the show.  The co-stars’ children are only three months apart in age and the cousins are seen playing in numerous family photos on each star’s social media pages.

Daniela spoke to Entertainment Tonight about the behind-the-scenes family dynamics.  “[Eric and I] started to play this couple thing before we became brother and sister-in-law,” Daniela explained. “Because we’ve gotten to know each other so well over the years, it’s made the family thing seamless.”

The NCIS: Los Angeles set must be one of the most child-friendly sets in town; in addition to the Olsen and Ruah-Olsen cousins, co-stars Chris O’Donnell has four children and LL Cool J has five!