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The couple are already parents to a son, Atticus, 5, and a daughter, Autumn, 7.
"We had always been open to a third, but definitely didn't think in the crazy year that the entire world was having that it would necessarily be this moment," the actress told PEOPLE. "I feel like we've been able to so far raise two really special kids who will be great role models."
"This has been such a pleasant, beautiful, surprising gift in this time to be able to get to do all that again with another little human," she continued.
Currently staring on the hit Fox drama 9-1-1, the brunette beauty was "proud" she kept her pregnancy a secret even while her character, Maddie, was expecting. The actress even stimulated an "intense" labor and birth on screen.
"Because my kids are a little bit older, it was a good reminder of being back in that space again. And [costar Kenneth Choi] was like, 'See? Playing pregnant got you pregnant!' I'm like, 'Yeah, I guess so,'" said Hewitt. "The craziest, most surreal moment was having to give birth while being pregnant. That was very interesting.
"And it was definitely a nauseous day for me. So that came with its own challenges, but it was a good recall back to those beautiful, amazing moments that you feel really excited about," she recalled of filming the delivery scene. "I got to remind myself of that and then also be in a really excited place of knowing that I will get to do that again."