After Adrienne Bailon dissed ex-boyfriend Rob Kardashian in a recent interview with Latina magazine, Rob's big sister fired back with several nasty tweets.

Bailon opened up about her relationship with Rob, but rather than taking the high road, she said she believed appearing on Keeping Up With the Kardashians had harmed her career. She added that she didn't understand why people took Rob's side when they split, noting that he cheated on her and was "disloyal."

Bailon, who dated Kardashian from 2007 to 2009, continued, "[I didn't think] anyone would even care. But they did, and do. To this day, people will still say, 'You ruined Rob's life!' and I'll think, 'Damn, I was still playing with Barbie dolls when I met him.'"

What did mama bear Kim have to say?
    "Funny how she says being with a Kardashian hurt her career yet the only reason she has this article is bc she is talking about a Kardashian ... #LetItGoooooLetItGoooooo (FROZEN VOICE) ... So sad when people try to kick my brother when he is down #FamilyForever."

Don't mess with Kimmy K!