It looks like the Brown family is yet adding another baby to the mix.

According to an exclusive report from PEOPLE, Kody Brown, star of the TLC reality series 'Sister Wives,' is expecting a baby with his fourth wife, Robyn (pictured, far right).

"You should have seen the look on his face when we found out," Robyn told PEOPLE. "It was priceless."

This will be the 17th child for the Brown family, which includes the three children Robyn had from a previous marriage.

As for Kody, the 43-year-old says he is "overjoyed" by the news, and that the pregnancy "connects Robyn and I together in a way that nobody can take away."

Robyn is due in mid-October.

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