Despite reports that Kim Kardashian never looks out for her brother Rob, Kim proved quite the opposite Tuesday night after finding out that his ex, Adrienne Bailon, spoke about their former relationship.

The singer and co-host of Fox's new daytime show The Real, did a an interview with Latina magazine about her career and past romance with Rob.

The actress shared that Rob was cheating on her, and claims that their relationship hurt her career.

"To be stuck with that Kardashian label, that was so hurtful to me and to my career," Bailon said. "I probably realized that too late -- not that it would've affected my decisions in terms of who I dated, but it would've affected my decision to appear on the show. 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.'"

Kim responded to the article on Twitter with a few hasty responses.

"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." she tweeted.

She also threw in a few jokes.

"#LetItGoooooLetItGoooooo (FROZEN VOICE.)"

Fans were more than surprised to see Kim sticking up for her little brother.

Check out more of her tweets, and a few fan reactions above.

Source:  Just Jared