So while Blac Chyna and Rob Kardashian’s relationship falls apart, big sis Khloé Kardashian’s relationship with beau Tristan Thompson is starting to get really serious. And if Kim Kardashian has anything to do with it, KoKo will be walking down the aisle any day now!

But Kimmy’s constant pushing might be too much for the NBA star.

MORE: Did Blac Chyna Have a Threesome With T.I. And Tiny? Rob Kardashian Tells All!

A source close to the Kardashian clan exclusively reveals to In Touch that Kim is really putting the pressure on her younger sister’s man to pop the question already!

“[Khloé] is madly in love with Tristan and wants to get married and have a family. But he hasn’t proposed yet, so Kim’s been pressuring him,” an insider says.

MORE: Kylie Jenner Officially Closes the Chapter on Her Romance With Tyga, Strategically Covers “T” Tattoo

Needless to say, the basketballer wasn’t pleased with the mother-of-two’s interference.

“Tristan was floored, especially since he hasn’t spent a lot of time with the Kardashian family — on purpose,” the source adds. “Kim was just looking out for Khloé, but her pushiness may have only made things worse.”

The couple, who began dating last September, has been taking major steps in their relationship and has even begun talking about starting a family together!

“Tristan and I definitely talk about starting a family,” the exercise enthusiast has said. “He wants to have five or six kids with me and that’s lovely. We could start at one and we could grow from there.”

Well, we guess time will tell if there is going to be another Kardashian pregnancy — but we think Kim might wanna lay off a bit!

For more on this story, pick up the latest issue of In Touch Weekly, on newsstands now! Plus click through the gallery below to see all of Khloé and Tristan’s cutest moments!