Brody Jenner on Kim Kardashian's Big News: "My Sister's Engaged?"

Looks like Brody Jenner did not receive the inside scoop on step-sister Kim Kardashian's engagement to Kris Humphries. He found out the exciting news with the rest of the world this morning!

"My sister is engaged? Hahaha I had no idea!!.. Crazy being in such a big family.. Congrats @Kimkardashian love you. Let's celebrate soon" Brody Tweeted earlier today.

OK! NEWS: SCOTT DISICK "VERY HAPPY" KIM KARDASHIAN'S ENGAGED

He also directed a special message at Kourtney and Khloe Kardashian

"@KourtneyKardash @khloekardashian Why don't you guys ever fill me in? Haha no text or anything?" he quipped on Twitter, and his sisters were apologetic.

"I thought kim would have?! LOL I die for u! "@BrodyJenner" Khloe Tweeted, followed by, "Yes @BrodyJenner our family is getting way too big! LOL let's all celebrate together!"

Kourt Tweeted back,"I was JUST thinking that! Let's celebrate! Miss u!" in response to Khloe's plan for a family reunion.