is expanding her family.
The actress, 35, and husband Shane Deary are expecting their second child
, her rep confirms to PEOPLE.
The new addition will join the couple's son River, 4.
Russell, who most recently starred in Running Wilde
, says she enjoys the balance between work and home that acting offers.
"I get to work really hard for three months but then I get to be home for four months where I get to put him to bed every night," she has said
"I like getting to be in the adult world a little bit and then getting to be in the mom world and cook dinners," she said. "And for me that balance is what makes it nice."
Reporting by JULIE JORDAN