Rob Kardashian may have hit a new low with his latest move.

After the reality star learned his fiancée and mommy-to-be Blac Chyna wasn’t invited to a baby shower being thrown for their unborn daughter, Rob blasted sister Kylie Jenner‘s number on Twitter, in addition to sharing a not-so-nice message to the 19-year-old.

MORE: Pregnant Blac Chyna Flaunts New Ferrari From Rob Kardashian on Snapchat

“Didn’t invite the mother of my child to a baby shower you were all trying to throw for me?! You must have lost your damn minds,” he wrote in a separate tweet.

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rob kardashian kylie jenner tweet

Rob, who tweeted Kylie’s phone number twice, insisted his account wasn’t hacked, “I ain’t hacked, this is Rob dog,” he tweeted.

Chyna, who’s pregnant with a baby girl, has had a hot-and-cold relationship with King Kylie since the 19-year-old began dating her ex Tyga. The two seemingly made amends during sister Khloé Kardashian‘s 32nd birthday, but after this harsh snub, their feud is still alive and well.

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