There's a new Kaitlynn coming to the Jenner family!
According to an eyewitness, the 32-year-old reality TV star gave a speech at the gathering, revealing how excited he is to spend the rest of his life with his "best friend," Carter.
The dinner menu included plenty of options, including New York strip steak, wood-roasted salmon and sea bass sliders, plus assorted desserts from the chef.
Jenner and Carter, a life-and-style blogger, were joined by around 30 of their closest friends, including Jenner's fellow Hills alums, Frankie Delgado and Spencer and Heidi Pratt.
No date for the wedding has been announced, but at the party, the couple did talk about wanting to get married somewhere close to the ocean.
The couple announced their engagement earlier this month with a sweet Instagram post. "On May 4th 2016 I got engaged to my lover and my best friend @kaitlynn_carter," Jenner wrote. "I couldn't be more in love with this woman and I can't wait to spend the rest of my life with her."
ET caught up with Jenner's ex, Kristin Cavallari, recently. Find out what she thinks about the engagement in the video below.