LITTLE ROCK, Ark. -- It will be a Happy Mother's Day, indeed, for Michelle Duggar. She's pregnant with her 18th child.

The 41-year-old mother is due on New Year's Day, and the latest child will join seven sisters and 10 brothers, including two sets of twins.

The fast-growing family lives in Tontitown in northwest Arkansas in a 7,000-square-foot home. All the children -- whose names start with the letter J -- are home-schooled.

The Duggars' oldest child, Josh, is 20, and the youngest, Jennifer, is 9 months old.

The family has a Web site at DuggarFamily.com.