Rob Kardashian has joined his big sisters Kim and Khloe in taking a pop at his ex-GF Adrienne Bailon.

The pop star had discussed her failed relationship with the Kardashian bro in a new interview with Latina magazine, and Kim had accused her of trading on the reality TV family's famous name.

FDB

— Khloé (@khloekardashian) July 30, 2014

Now Khloe has waded in to the row too, tweeting the offensive acronym "FDB" in response to Bailon's interview.

The initials stand for "F**k dat b**ch", in case you're not up on your LA street slang.

Rob then re-tweeted Khloe's comment himself.