Bette Midler has mocked Rob Kardashian and Kylie Jenner while pointing out they could end up sharing a stepchild.

Bette Midler

Bette Midler

The 70-year-old legendary performer has taken a swipe at the Kardashian/Jenner family again after finding out that Rob and Blac Chyna are engaged, which means if they get married he will become step-father to Blac's ex Tyga's son King Cairo while his half-sister Kylie, who is now dating the 'Rack City' rapper, would also become step-mother to the three-year-old if they got hitched.

Taking to her Twitter account on Thursday night (14.04.16), Bette quipped: "Rob Kardashian's engaged to the MOTHER of the child of Kylie Jenner's boyfriend? They'll share a stepchild? Somebody send me a chart!"

Bette's Twitter outburst follows her remarks a few weeks back when Kim Kardashian West, 35, posted a naked selfie.

The pair shared several fiery exchanges including Kim saying she was a "fake friend", which Bette hilariously responded to by saying the 'Keeping Up With The Kardashian' beauty can't "take a joke".

Kim previously tweeted: "hey @BetteMidler I really didn't want to bring up how you sent me a gift awhile back trying to be a fake friend then come at me #dejavu (sic)."

And Bette replied: "I never tried to fake friend you. Looks like anyone can take a selfie but not everyone can take a joke... (sic)