'Sister Wives' star Robyn Brown expecting a girl!

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'Sister Wives' Stars Kody and Robyn Brown Reveal They're Expecting a Girl

It looks like the Brown family will be welcoming a daughter!

Sister Wives star Robyn Brown is pregnant with a little girl! The news was revealed on Sunday's episode of the TLC docu-series, and shared by Robyn's husband Kody on Twitter.

"It's a GIRL!" Kody tweeted. "Yippie!"

WATCH: 'Sister Wives' Star Robyn Brown Is Pregnant!

Robyn, 37, and Kody, 46, are part of a polygamous relationship, in which Kody is "spiritually married" to three other women as well -- Meri, 41, Janelle, 46, and Christine, 43.

Kody had been legally married to Meri, however the two got a divorce so that he could marry Robyn, the youngest of his brides.

Between Kody and his four partners, the family has a combined 17 children, and this new addition will make 18.

See photos of the Kody Brown and his famous family:

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'Sister Wives': Kody Brown and wives
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'Sister Wives' star Robyn Brown expecting a girl!
FILE - In this file publicity photo provided by TLC, Kody Brown, center, poses with his wives, from left, Robyn, Christine, Meri and Janelle, in a promotional photo for the reality series, "Sister Wives," which aired in March 2011. When the polygamous family learned in December 2013 that a federal judge in Utah struck down key parts of the state's polygamy laws, Brown and his four wives said they cried and felt deeply emotional. The family said they are grateful for the ruling, but said winning the lawsuit they brought against Utah in July 2011 doesn’t ease the pain caused by the significant personal sacrifices they made when they fled the state for Las Vegas under the threat of prosecution. (AP Photo/TLC, George Lange, File)
FILE - In this undated file photo provided by TLC, Kody Brown, center, poses with his wives, from left, Janelle, Christine, Meri, and Robyn in a promotional photo for TLC's reality TV show, "Sister Wives." A lawmaker who says Utah should avoid legislating morality wants to change the law to comply with a federal judge’s ruling striking down key parts of the state’s polygamy laws. (AP Photo/TLC, Bryant Livingston, File)
LAS VEGAS, NV - OCTOBER 03: (L-R) Television personalities Janelle Brown, Kody Brown and Christine Brown from 'Sister Wives' arrive at the show 'RockTellz & CockTails presents Meat Loaf' at Planet Hollywood Resort & Casino on October 3, 2013 in Las Vegas, Nevada. (Photo by Gabe Ginsberg/FilmMagic)
LAS VEGAS, NV - DECEMBER 15: Cast of TLC's 'Sister Wives' Christine Brown, Janelle Brown, Kody Brown, Robyn Brown and Meri Brown attend the Nevada Ballet Theatre's Production of 'The Nutcracker' opening night performance at the Smith Center on December 15, 2012 in Las Vegas, Nevada. (Photo by Marcel Thomas/FilmMagic)
LAS VEGAS, NV - APRIL 13: (L-R) Janelle Brown, Meri Brown, Kody Brown and Christine Brown from 'Sister Wives' attend a pre-show reception for the grand opening of 'Dancing With the Stars: Live in Las Vegas' at the New Tropicana Las Vegas April 13, 2012 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images for AEG Live)
GOOD MORNING AMERICA - Kody Brown, joined by three of his four wives Meri, Janelle, and Christine (his 4th wife Robyn is too pregnant to travel), talks about their show 'Sister Wives,' .on GOOD MORNING AMERICA, 9/21/11, airing on the ABC Television Network. (Photo by Ida Mae Astute/ABC via Getty Images)KODY BROWN, MERI BROWN, JANELLE BROWN, CHRISTINE BROWN
LAS VEGAS, NV - APRIL 14: (L-R) Robyn Brown, Meri Brown, Kody Brown, Christine Brown and Janelle Brown from 'Sister Wives' arrive at the grand opening of Mike Tyson's one-man show 'Mike Tyson: Undisputed Truth - Live on Stage' at the Hollywood Theatre at the MGM Grand Hotel/Casino April 14, 2012 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
GOOD MORNING AMERICA - Kody Brown, joined by three of his four wives Meri, Janelle, and Christine (his 4th wife Robyn is too pregnant to travel), talks about their show 'Sister Wives,' .on GOOD MORNING AMERICA, 9/21/11, airing on the ABC Television Network. (Photo by Ida Mae Astute/ABC via Getty Images)GEORGE STEPHANOPOULOS, KODY BROWN, MERI BROWN, JANELLE BROWN, CHRISTINE BROWN
PLYMOUTH, MA - SEPTEMBER 10: Kody Brown of Sister Wives visits Plymouth Beach on September 10, 2011 in Plymouth, Massachusetts. (Photo by Stephen J. Cohen/Getty Images)
BEVERLY HILLS, CA - AUGUST 06: TV personalities Meri Brwon, Janelle Brown, Kody Brown, Christine Brown and Robyn Brown speak duinrg the 'Sister Wives' panel during the Discovery Communications portion of the 2010 Summer TCA pres tour held at the Beverly Hilton Hotel on August 6, 2010 in Beverly Hills, California. (Photo by Frederick M. Brown/Getty Images)
PLYMOUTH, MA - SEPTEMBER 10: Kody Brown of Sister Wives visits Plymouth Beach on September 10, 2011 in Plymouth, Massachusetts. (Photo by Stephen J. Cohen/Getty Images)
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Kody and Robyn already share one child, 4-year-old son Solomon. Robyn is also mother three other children -- 15-year-old son Dayton, 13-year-old daughter Aurora and 10-year-old daughter Breanna -- from a previous marriage.

WATCH: 'Sister Wives' Divorce: Family Has Been 'Legally Restructured'

It was recently announced that Kody legally adopted Robyn's other children after they were legally wed.

The new addition to the Brown family is due Jan. 7.

Roby and Cody first revealed they were expecting a new baby back in June. For more on Robyn's pregnancy announcement, check out the video below.

'Sister Wives' Stars Announce 18th Child

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