It looks like “Sister Wives” star Kody Brown had a very happy Father’s Day! On Sunday, the reality TV dad rang in the celebratory holiday honoring fatherhood with his 17 -- wait, make that 18 -- of his children.

That’s right! Everyone’s favorite TLC family is about to get even bigger. Robyn, the youngest of Kody’s sister wives, gave her husband an early Father’s Day present when she announced two days prior to the holiday that she was pregnant.

"We are so happy to announce an eagerly expected new member of the Brown family!" the couple confirmed to People magazine on Friday, revealing that their polygamist clan was going to grow. The Browns are reportedly expecting their baby on Jan. 7, 2016.

Robyn shared her excitement on Twitter regarding her pregnancy, before giving Kody a special Father’s Day shout out on her social media page. “Happy Father’s Day @realkodybrown! You will always be a hero in my book because of your love and devotion to all of our 18 children," she said.

And Robyn wasn’t the only one of Kody’s sister wives to acknowledge the Brown patriarch on Sunday. Both Christine and Janelle tweeted out their appreciation for Kody in under 140 characters.

The ladies stated how “blessed” their children were to have a role model like Kody as their father. “It says something when the older kids still seek your counsel,” Janelle gushed.

Kody shared some of that coveted wisdom with People magazine when he gave a tip to soon-to-be fathers. "I try to always be kind and tender, but when a woman is expecting, you have to be ultra-sensitive," Kody, who experienced his fair share of pregnancies, recently said. "And always do the dishes."

Robyn joined the Brown family in 2010, becoming the fourth sister wife along with Meri, Christine and Janelle. The expecting parents currently have four children together, three who are from Robyn’s previous marriage.

In 2014, Robyn recently became Kody’s legal wife after Meri willfully decided to divorce her husband of 24 years for the sake of the family.

“Robyn has her three kids from her previous marriage that we have wanted to get adopted by Kody,” Meri said during the show’s climatic Season 5 finale. “But to do that she’ll need to have a legal marriage to Kody.”

Meri’s decision to step down as Kody’s legal wife shocked Robyn, even causing her to break down in tears. “It was huge to me. I love that woman,” Robyn said during her confessional.

"Sister Wives" will return for more drama in the fall when Season 6 premieres.

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