A Mississippi woman is sharing a truly incredible story after delivering one more baby than she expected.

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At age 42, Kimberly Fugate said she wasn't even planning to have more children, but then last year she found out she was carrying identical triplets.

She went into labor last weekend at University of Mississippi Medical Center and that's when the story got even more unbelievable.

Fugate thought her delivery was over when the doctor told her he saw "more feet."

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It turns out a fourth little one had managed to hide the whole time, as doctors failed to see her on the ultrasounds Fugate's doctor said he had never seen anything like that happen before.

Kenleigh, Kristen, Kaleigh and the surprise fourth, Kelsey, are all doing OK, but will remain in the neonatal intensive care unit until May since they're premature.

The odds of having identical quadruplets are estimated to be 13 million to 1.