Kim Kardashian on Kylie Jenner's Pregnancy: "The Best Kept Secret of Our Generation"

Kylie Jenner’s (still) enhanced pout was sealed when it came to her pregnancy — and she kept it closed the whole time with trusted family and friends also not leaking a word to the press about how far along she was.

On Sunday's Keeping Up With the Kardashians, Kim Kardashian tells Khloe how fun it is to “play the Kylie game” and watch people guess is she or isn’t she about Kylie’s growing bump. Kylie was able to keep her pregnancy with rapper Travis Scott under wraps until the birth, with the exception of a few leaks about her baby shower.

"The funnest game ever is the Kylie pregnancy game," Kim admits. "Why?" Khloe asks. "Just to see what people think," Kim says. "There were pictures of her out on TMZ and she looked so skinny."

Kim decides the undercover operation was so genius, she tells Kylie, “your pregnancy has been the best kept secret of our generation.”

"Like, I'm not trying to keep a secret, I'm doing this for myself," Kylie said. Although, to be fair, not leaving the house for nearly a year and not addressing questions about being pregnant is the definition of keeping it a secret, Just FYI, Kylie, But you do you.

"Your friends deserve awards," Kim tells her little sister. "'Cause seriously, now you know you have some real ones 'cause that never would've happened in my day."

We learned even more about the top secret pregnancy when Caitlyn Jenner appeared on ITV's Loose Women as a guest panelist recently, and talked about her youngest daughter’s pregnancy.

“She’s always wanted to be a mom but when she called me up it was a bit tough for her because, obviously, she’s not been married…But [Kylie] wanted to start a family, she wanted to start it young. Fortunately, she’s in a position where she can have a child and the child will be well taken care of,” Caitlyn said of granddaughter Stormi, whom Kylie and Travis welcomed on Feb. 1.