Does he really expect us to believe this?

Brody Jenner caught a flight out of LAX yesterday, and when he was asked about half-sister Kylie's new baby girl, he claimed to not even know she was expecting!

"Well, to be honest, I didn’t even know she was pregnant for the entire pregnancy. Now I found out and would love to see her," he told videographers.

Has The Hills alum been living under a rock? Even if the LipKit queen didn't call him up to tell him personally, there's no way he didn't see her on the cover of a magazine in the grocery store, or on the news, or on that little thing called the Internet. Give us a break! We also find it hard to believe that loud mouth dad Caitlyn Jenner didn't let the secret slip to her sons, considering she's especially close with Brody's older brother Brandon.

In other Ky news, fans think the reason she named her daughter Stormi is because of the "butterfly effect," which is thought to be when a butterfly even slightly flaps its wings, it can cause a change in weather or a... you guessed it, storm. The makeup mogul and her rapper beau are obsessed with butterflies, but this seems like people are reading into it a little too much.

Hey Brody, might want to send a butterfly cake and congratulate your sibling!