Alyssa Bates tied the knot with John Webster on May 24, 2014. Michael Cappetta/ABC

The Bates family of 21 celebrated the wedding of their daughter Alyssa Bates over the weekend.

Bates tied the knot with John Webster in Knoxville, Tenn., on Saturday, with her parents, Gil and Kelly Jo Bates, and all the rest of her 18 siblings in attendance. The couple got engaged on Jan. 16.

"Nightline" was there when Alyssa and John said their "I do's" and will air a segment about the family in the coming weeks.

Family friends The Duggars, of TLC's "19 Kids and Counting" fame, were also at the wedding, including Jill Duggar, whose engagement has been the recent focus of the family's reality show.

The two families have been close friends since their children were young and the Bates even had their own TLC special, "The Bates Family: Baby Makes 19," which aired in 2012.

Like the Duggars, the Bates family are evangelical, conservative Christians who live a modest lifestyle and do not believe in the use of birth control.

Today, the Bates brood includes Zach, Michael, Erin, Lawson, Nathan, Alyssa, Tori, Trace, Carlin, Josie, Katie, Jackson, Warden, Isaiah, Addallee, Ellie Bridget, Callie-Anna, Judson Wyatt and finally, the newest member of the clan, Jeb Colton.