Michelle and Jim Bob Duggar are expecting another baby—their 20th to be exact.

Michelle, Jim Bob, their 19 kids, and two grandkids made the announcement Tuesday morning on "The Today Show."  The family is best known for their show on TLC called “19 Kids & Counting.”

“We always have the motto around our house ‘there’s always room for one more,’ and they are such a gift.  We are so grateful for each one of them,” said Michelle who is now three-and-a-half months pregnant.

“We didn’t want to stop at an odd number either,” added Jim Bob.

The Duggar clan lives in Tontitown, Ark.  Their oldest son, Joshua, 23, has two kids of his own with his wife, Anna.  Michelle and Jim Bob welcomed their youngest child, Josie, in December 2009.

Michelle, 45, says she’s working out five or six times a week on her elliptical machine and feels like she’s in better shape now than she has been in a long time.

When asked if this pregnancy would be their last, Michelle said, “We’ll wait and see.”

Michelle and Jim Bob say they’ll find out the sex of the baby in late December.

Click here to watch the announcement.