The Brown family is currently gearing up for its 18th child!
"We are so happy to announce an eagerly expected new member of the Brown family!" the pair said in a statement.
Robyn is already a mother to three children from a previous marriage, as well as one biological child with Kody -- 3-year-old Solomon. Kody has one child with his first wife, Meri, six with his second wife, Janelle, and six with his third wife, Christine.
From the sound of it, the TLC star is already well-prepared for Robyn's pregnancy.
"I try to always be kind and tender, but when a woman is expecting, you have to be ultra-sensitive," he said. "And always do the dishes."
Sister Wives, which documents the life of the polygamist Brown family, first aired on TLC in 2010.
Check out the video below to see what happens when two anthropology students become interested in moving in with the Browns to study the complex workings of the polygamist family, and Kody and his wives must evaluate their prospective roommates!