The actress and her "Client List" co-star fiancé Brian Hallisay are expecting their first child in December, and Hewitt said every day is full of surprises.
"You wake up in the morning and you go, "Wow, this is no longer my body," she said. "What's going to happen today? It teaches you to not be in control and I've been a control freak for a long time."
"Your body goes through a lot of changes," she said. Among those changes? The cravings.
"So, like Mexican food for me is it right now," she said. "If someone's like, 'What do you want for breakfast?' I say 'Mexican. And I want it for lunch and dinner too!' That's pretty much all that I eat."
But the biggest surprise of them all: the baby's gender.
"I don't know," she said. "It's one of life's greatest surprises and we wanted to keep it that way."
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