Their family is already the biggest one on television, but the Williams family of TLC's My Five Wives will be expanding not too long into the new year.

Nonie Williams Reveals If She's Having A Boy Or A Girl

Brady's fourth wife, Nonie, will be giving birth to her sixth child, and Brady's 25th overall, in the earlier half of 2015, according to the family's Facebook page.

In a post from December 29, Nonie poses with either Marissa or Tailee as she takes a photo of her growing belly in the bathroom of her home-and the information given with the photo explains quite a bit about the newest addition expected in the family.

Nonie is Pregnant!

 

"Just to clarify our earlier post. In Williams speak Nonie is due the end of February (because she seems to deliver a couple to three weeks early) but in Dr. speak she is due mid March. We can't wait to hold our little girl," the post read.

The baby will mark the fourth daughter Nonie has had.

Overall the Williams family consists of Brady and his five wives-Paulie, Robyn, Rosemary, Nonie and Rhonda, and their combined children.

Brady and Paulie are the parents of: Karlie, Joshua, Madeline, September, Maura and Camry

Brady and Robyn are the parents of: Hannah, Lauren, Dane, Thomas and Trey

Brady and Rosemary are the parents of: Kimberly, Taylor, James and Brandon

Brady and Nonie are the parents of: Paul, Rachel, Marissa, Aayden and Tailee

Brady and Rhonda are the parents of: Eden, Lake, Arwen and Nicholas.

Adding to the family, Karlie has since married her husband, Jake Jessop, and the two have welcomed a son, "Huck", who was born premature.

It is unclear when a third season of My Five Wives will air.