AceShowbiz -

Kylie Jenner and her beau Tyga are reportedly determined to have a child of their own to get revenge on Blac Chyna. Kylie's plan for a pregnancy has nothing to do with being "madly in love," according to a family friend.

"Everyone knows Kylie's not the brightest candle on the cake, but to plot a pregnancy around revenge is just plain stupid," the friend tells Radar Online, "She insists she wants Tyga's baby to prove to the world that their love is true, but even that's crazy talk."

Kylie was allegedly blindsided by Blac and Rob Kardashian's pregnancy news. "This is about marking her territory and stealing the limelight from Blac and Rob," says the friend, "Kylie shouldn't feel the need to prove anything if her relationship with Tyga is real."

"No one can talk any sense into Kylie right now," the friend continues, "She's dangerously obsessed with getting pregnant with Tyga and he's cash-strapped enough to go along with it to keep her on the hook."

The report comes after Kylie shut down rumors that she's expecting a baby with Tyga. "Omg. No I'm not pregnant. It's been the same rumor for years & no baby...," she tweeted earlier this week, "So when I decide to go to that next stage in my life...I'll be the first to let you know...Not a weekly blog."