The newest member of the Brown family is yet to come. The due date of Kody's new legal wife Robyn has come and gone but the baby girl is yet to arrive. Either way, it is believed that Robyn's pregnancy will be a big deal in "Sister Wives" season 7.

Two days before her due date, Robyn tweeted that they "are all ready to meet Baby Sister." She even added that she is "trying to be patient but can't wait to see her sweet face." In her latest tweet, however, she confirmed that the 18^th member of the polygamous family seems to be prolonging the suspense.

"Hmmmm....due date came and went. When is this little girl going to come?" Robyn wondered. This, needless to say, marks the beginning of the reality star's agonizing wait for the new baby, who should be the latest star in "Sister Wives" season 7.

Robyn and Kody first announced that they were expecting a baby back in June. As Robyn's belly grew, the pair kept themselves busy with a legal battle that eventually entitled Kody as the father of Robyn's three kids from her previous relationship.

For a while now, it is being said that "Sister Wives" season 7 will mostly be all about Robyn, especially with another big moment Kody and she will share in the days to come. The rest of Kody's wives -– Meri, Christine and Janelle -- will allegedly be getting less exposure on the show.

In fact, the three women are allegedly leaving the show and Kody altogether not just for the reason that their part on the show is diminishing but because of their husband's attitude and treatment toward them.

"It's just not the loving polygamist marriage people see on TV," a source told In Touch Weekly (via Radar Online). The insider claimed the Meri will "certainly" leave while Janelle is growing unhappy and Christine has had enough of Kody fat-shaming her.

It remains to be seen if this will really be the case in "Sister Wives" season 7. For now, all fans can do is wait until the new season premieres early this year.