Michelle and Jim Bob Duggar, who are both licensed real estate agents, announced their news on TODAY in the States, with Michelle admitting she was surprised to be pregnant again at 45:
"We are so excited. I was not thinking that God would give us another one, and we are just so grateful."
The couple have always said they leave their family planning to God, refusing to use birth control. During Michelle's last pregnancy, when she was expecting her youngest, Josie, she suffered pre-eclampsia, and her daughter was born three months prematurely, weighing just 1lb, 6 oz at birth.
Luckily, Michelle hasn't had any health worries with her 20th pregnancy so far.
The Duggars' 19 children range from 23 years to 23 months. The family roll call (all Js!) reads:
Joshua, Jana, John-David, Jill, Jessa, Jinger, Joseph, Josiah, Joy-Anna, Jedidiah, Jeremiah, Jason, James, Justin, Jackson, Johannah, Jennifer, Jordyn-Grace, Josie.
"Their mouths dropped," says Michelle. "They all looked at me to see if he was joking."
While number 20 might sound like it was a 'happy surprise' for the pair, Jim Bob reckons one more was always on the cards for the family:
"Michelle and I both feel like some of the most blessed parents in the world. Our children are so sweet, we are so grateful to God. We didn't want to stop on an odd number."
Clearly a fan of even numbers and the letter J then...any bets on a name for number 20?
We recently reported on another bumper American family.
Kelly and Gil Bates are hot on the Duggar family's heels, expecting their 19th baby...