The relationship was just for show, though, and all parties have since denied any romantic involvement.
However, their relationship was short-lived, and the two decided they were better off as friends.
2007: Jenner Joins The Hills as Lauren Conrad's Love Interest In 2007, Jenner joined The Hills as Conrad's swoon-worthy new love interest.
Jenner "started" the conversation as they were discussing singer Lavigne's upcoming tour dates in Asia.
"He told her he was tired of always being her plus-one, and always going on tour with her." PHOTOS: Hills stars then and now Former star Jenner, 26, "said he needs a career of his own again, and he didn't want to go on the tour.
CONGRATULATIONS to @brodyjenner & @kaitlynn_carter who got ENGAGED in Nihiwatu!
Avril Lavigne and Chad Kroeger are engaged, her rep confirms to Just
Take a look back at his relationship history, and share whether you think it's time for Brody to finally consider looking for a lady who's marriage material. Lauren Conrad (October 2006): The two didn't have the lasting power that Brody/K-Cav did -- you can thank Jen Bunney for that.
Bryana Holly (July - November 2013): His first relationship since his split with longtime love Avril Lavigne, Brody began dating the sexy surfer model last summer. Avril Lavigne (February 2010 - January 2012): Despite professing their love for each other with permanent ink, these two were little more than a temporary match made in Hollywood. Nonetheless, their short-lived relationship really Nicole Richie (Fall 2006): Brody and his childhood pal briefly dated after his split from Kristin. Kristin Cavallari (August 2005 - August 2006): The two were the very picture of young love, and later, friends with benefits on "The Hills" (or were they? K-Cav later admitted that her second relationship with Brody was more for show.
The Jenner brothers have had a notoriously on-and-off relationship with the extended Jenner-Kardashian family, and no one from the clan has publicly commented on the new engagement as of yet.