"I can confirm Megan is expecting her second child with her husband Brian," the actress' rep confirms to PEOPLE. "They are both very happy."
The couple welcomed their 10-month-old son, Noah Shannon, last September. Green, 40, is also dad to 11-year-old son Kassius Lijah from his prior relationship with Vanessa Marcil.
"All I wanted to do my whole, whole life was have a baby and, now, I've finally done it," the Teenage Mutant Ninja Turtles star, 27, said in March.