'18 Kids and Counting' mom expecting No. 19

Jim Bob and Michelle Duggar welcomed their 18th child, Jordyn-Grace Makiya, last December. The Arkansas couple are expecting their 19th child on March 18, 2010.

LITTLE ROCK — Michelle Duggar, the 42-year-old Arkansas mom of 18 and a soon-to-be grandmother, is pregnant again.

Duggar said Tuesday that she took a pregnancy test on a whim and was shocked to see she was pregnant.

Meanwhile, she is gearing up to become a grandmother for the first time. Her oldest son, Josh, and his wife, Anna, are expecting their first child next month.

Michelle Duggar and her husband, Jim Bob, live in Tontitown, Ark. They are featured with their family on TLC's 18 Kids and Counting.

Michelle Duggar says she's nearly 12 weeks along and due on March 18.