Actress Daniela Ruah is expecting her second child.

The NCIS: Los Angeles star, who plays Special Agent Kensi Blye on the hit show, and her husband David Olsen will welcome a sibling for their two-year-old son River Isaac Ruah Olsen later this year (16).

The mom-to-be announced the news via Instagram.com on Monday (18Apr16), sharing a sweet photo of the couple and little River exercising outdoors. In the shot, Ruah shows off her growing baby bump in a fitted tank.

"There are four people in this photo, can you spot them all?" she captioned the snap.

The couple's unborn child won't be the only new addition to the Olsen family in 2016. David's brother, Ruah's co-star Eric Christian Olsen, is also set to become a dad for the second time.

Eric and his wife Sarah Wright Olsen went public with their baby news last month (Mar16). They are already parents to two-year-old son Wyatt Oliver.

Ruah and David, who serves as brother Eric's stunt double, met on the set of NCIS: Los Angeles. They wed in 2014.