Britney Spears' collab with will.i.am doesn't sound anything like any other Britney song ... something Eve attributes to the theory that it's not actually her.

Yes, "Scream & Shout" is sung by an impostor, she insinuated.

""I heard it might not be Britney," Eve told Bravo's Andy Cohen when asked what she thought of the song. "That's what I heard, but you know, I don't know."

"It could be Britney. But I heard it wasn't."

Jeff Raymond, Britney Spears' rep, called Eve's claim "absolute BS ... Britney sang the song. Will.i.am wanted her for this song and she sang on it."