NBA's Iman Shumpert -- Delivers Baby In Bathroom ... Used Headphones to Tie Umbilical Cord

Iman Shumpert sprung into the role of OBGYN Wednesday -- when his fiancee went into labor in their home ... and the NBA star delivered the kid right in their home bathroom!!!

R&B superstar Teyana Taylor says she had no idea she was in labor until she felt the child's head making it's way out of her around 6 AM.

"It took two ten count pushes with my fiancé playing Dr and she entered this world into his bare hands!"

Teyana says the Cleveland Cavs star was on the phone with the emergency operator who walked him through the process -- and he used a pair of red headphones to tie the umbilical cord (since they didn't have a medical grade clamp).

As for the baby, "She opened her eyes right away, gazed into mine and never cried!"

"She has blown Christmas away! Our family is complete. Her blueprint will be unmatched. Welcome Iman Tayla Shumpert Jr. Mommy carried you. Daddy delivered you."