As Us Weekly reported, the former Disney Channel star gave a no-holds-barred interview to the outlet about her relationship with Rob, revealing she believed appearing on Keeping Up With the Kardashians had harmed her career.
She also admitted she struggled to understand why people sided with the reality TV star, saying Rob cheated on her and was "disloyal."
"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," blasted Kim in the early hours of the morning.
"#LetItGoooooLetItGoooooo (FROZEN VOICE)," the mom of one added, before sticking in a final dig, "So sad when people try to kick my brother when he is down #FamilyForever."
Bailon, 30, dated the Kardashian brother, 27, from 2007 to 2009.
The actress, who rose to fame in The Cheetah Girls trilogy, insisted she still can't understand why everyone's so fascinated about the relationship. "[I didn't think] anyone would even care. But they did, and do," she told Latina. "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.'"