During a discussion on her talk show, The Real, about troubled child stars, Bailon noted that the pop star had the "ultimate meltdown."
Bailon then went on to recall her stint as a backstage host on the X Factor and her interaction with Spears.
"I worked with her on the X Factor, and I'm not going to lie to you, guys...She can't hold a conversation," she told cohosts Jeannie Mai, Loni Love, Tamar Braxton and Tamera Mowry-Housley. "They had someone who feeds her what she is supposed to say. Like, she can't hold a conversation."
Bailon's cohosts, though, seemed to cut Spears a break.
"This is what I hear," said Braxton. "Behind the scenes, she's trying to get it together."
To which Mowry-Housley added, "And we have to respect that."
In January, it was announced that Spears had decided to leave the X Factor after serving as a judge during its second season.