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The couple's daughter, Margaret Heather Christian, was born Saturday at 12:21 p.m. She weighed at 8 lbs., and was 21 inches long.
"Kellie and Maggie are both doing very well," her rep tells PEOPLE.
When Martin, 31, revealed in August that she was pregnant, she told the Associated Press that she barely had any experience with kids.
"I never even babysat," she said at the time. "The only time I've changed a diaper is when my friend, who just had a baby, called and said, 'Come over, you need to practice.'"
