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from www.TMZ.com – Kim Kardashian’s sex tape sales have exploded since Kanye West told the world they’re expecting … TMZ has learned.

We spoke to the folks at Vivid Entertaintment — which owns ‘Kim K. Superstar’ — and discovered lots of Kim’s fans are celebrating the baby with umm … visual aids.

Vivid says video-on-demand purchases of the sex tape have spiked 80% since Sunday night … the fattest increase they’ve seen since Kim’s wedding to Kris Humphries.

Further, Kanye’s been boosting biz for months now. We’re told overall sales of Kim’s sex tape — be it VOD, online, or DVD — have steadily increased every month since he and Kim hooked up last Spring.

So, the real winner in the whole Kimye baby hysteria — Ray J!

Dude, just keeps raking in those sex tape dollars.