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4. Zoe Saldana and Marco Perego
Zoe Saldana and Marco Perego are proud parents to three boys, but the last little one came out of nowhere.

On Saturday, Feb. 18, the Guardians of the Galaxy Vol. 2 star announced the good news via Instagram: "Marco and I are elated to share the news of the the birth of our son Zen," she wrote. "We couldn’t feel more blessed with the new addition to our family. #threeboys... oh boy!"

The news was a surprise because Saldana had not been publicly expecting. It remains unclear if Zen was produced via surrogacy, adoption, or one very low-key pregnancy.