The Jenners will soon welcome a new Kaitlynn into their family.

That's right. Caitlyn's baby boy is all grown up and getting married. Brody Jenner announced the happy news with a sexy Instagram post on Friday, May 6. In the photo, the happy couple lounges in a tropical setting as Kaitlynn sweetly kisses her fiancé.

"On May 4th 2016 I got engaged to my lover and best-friend," Brody writes. "I couldn't be more in love with this woman and I can't wait to spend the rest of my life with her."

In her own IG post, which captures the same moment from a slightly different angle, Kaitlynn shows off her new sparkler and expresses her excitement. "This trip has been memorable for many reasons..." she said, "happiest girl in the world!!!"

this trip has been memorable for many reasons... ❤️❤️ happiest girl in the world!!!

A photo posted by Kaitlynn Carter (@kaitlynn_carter) on

Many may remember that Brody started dating Kaitlynn back in 2014, but Kim Kardashian thought their relationship too new to offer Brody, her stepbrother, a plus one to her wedding with Kanye West. Brody boycotted the entire event as a result. It wasn't pretty.

Since then, Brody remains relatively distant from the Kardashian sisters. In a recent interview with Yahoo Style, the former "Hills" star said, "I don't see them very often. I live out in Malibu, they live in Calabasas. To be honest, I don't even really know Kanye that well at all. I've really only met him one time."

Brody continued, "That's the one thing that people don't really understand is that we live two completely separate lives. And everybody ties us in together as the Kardashians and the Jenners. I mean, [Kris and Caitlyn] got a divorce, so they're not even technically my family anymore."

One thing is for sure, we won't count on seeing Kim and Kanye on Brody and Kaitlynn's wedding invite list.