Rob Kardashian appeared to tweet out the phone number of sister Kylie Jenner to his 6.65 million Twitter followers on Monday evening. The reality star seems to have lashed out at his sibling after his fiancée, Blac Chyna, wasn't invited to a baby shower his family were throwing for him.

Kylie JennerKylie Jenner's phone number was made public by her brother Rob on Monday

Rob first tweeted ‘Kylie’s #’ followed by a phone number and 16 crying-laughing emojis, while also writing ‘I ain't hacked either this is rob dog lol’.

More: Rob Kardashian And Blac Chyna Reveal They Are Expecting A Girl

He then tweeted the same phone number again. A third tweet read: ‘Didn't invite the Mother of my child to a baby shower you all were trying to throw for me ‼? You all must have lost your damn minds.’

People magazine reports that the phone number tweeted by Rob is now out of service, but a source confirmed that it did indeed belong to 19-year-old Kylie.

Rob and Kylie have a bit of a complicated family situation (to say the least) thanks to their current relationships. Rob is expecting his first child with fiancée Blac Chyna, who is the former wife of rapper Tyga, the current boyfriend of Kylie.

More: Blac Chyna Reveals Why She Won't Be Marrying Rob Kardashian Anytime Soon

But the siblings were thought to be back on good terms recently and in April Kylie even posted a series of selfies with Chyna, captioning one: ’we’ve been best friends the whole time.’