Paris Hilton -- Opening Up About Her Chest (PHOTO)

Paris Hilton hasn't been very open about alleged massive changes to her boobs ... luckily her robe is plenty open.

While she's refused to talk about her chest ... she's still sharing A LOT of it in this super hypnotic selfie she posted.

Either Paris is REALLY good with makeup -- there's a lot of it in the pic -- or those whappers are doctor-enhanced.