"I thought I was kind of past the point where this could be a reality for me," Halle told CNN. "So it's been a big surprise and the most wonderful."
Halle has also revealed that her daughter Nahla has desperately wanted to become a big sister.
"Every night, we do our prayers... She says, 'God, please bring me a bunk bed and a baby sister.' And I say, 'I can do one of those things, I know for sure. The other one, we've got to keep praying on'," said the star.