Kim Kardashian -- Doin' the Bump ... Somebody's Showing (VIDEO)

Kim Kardashian's 3 months of pregnancy is starting to show in the usual places -- and they're all on display in NYC.

Kim and Kanye West were out in the rainy city Monday morning and as they bolted in and out of buildings ... it appeared there was a hint of a baby bump starting to show.

More importantly (if you're into this sorta thing) ... there are clear signs the sequel will begin filming soon -- Mom Boobs, Part 2! This time they mean business.