This is the best kept secret!

Kylie Jenner and Travis Scott are rumored to be engaged, but even the LipKit queen's own sister Kim K has no idea if the rapper has officially popped the question yet!

"You know, I literally need to ask her. That is going to be my next question in our group chat,” Kimmy K told ET at the KKW Beauty and Fragrance pop-up shop.

So does she have any idea why they already call each other husband and wifey?

“I think we just all think that’s, like, you know, what they call each other, but I have no idea. I’m just like you guys. I’ll find out. I don’t know if I’ll share the news with you guys, but I’ll have to ask myself," she added.

From the sounds of it, the young billionaire and her beau would let us in on the happy news if there was anything to report.

"Kylie is not married and if she was going to be married, or even engaged, her fans would be the first to know. Kylie wants a big over-the-top wedding and believes that she deserves nothing less. She isn’t about to go and get hitched in some courthouse in Calabasas!” a source dished to Radar.

We can't wait to see Ky as a bride!