The celebrity hackers are back ... with a vengeance. The latest victim appears to be Rihanna -- despite the fact that a simple Google search reveals her boobs line the online landscape. Early Sunday AM two nude pictures that appear to be RiRi were leaked onto 4chan/Reddit ... one with a censored version of her breasts ... the other pic showing bare ass and slight nipple.They look like they were taken during some sort of fitting.As we previously reported ... a second wave of leaks has been going down all weekend -- nude pics of what appears to be Kim Kardashian, Vanessa Hudgens, Kate Bosworth and Hope Solo have all surfaced.Gabrielle Union is also a victim -- topless pictures of her surfaced -- and she told us her legal team will contact the FBI.We reached out to Rihanna's rep -- so far, no word back. 11:00 AM PST -- Photos also leaked online showing what appears to be Meagan Good taking a topless selfie. There's also 2 videos that appear to show Abigail Spencer from "Suits" naked.