Kim Kardashian‘s sex tape sales have sky rocked since her and Kanye West announced she was preggo. TMZ reports that Vivid Entertaintment, which owns the sex tape ‘Kim K. Superstar’ says that fans are excited about the new baby on the way and sales are up! Video-on-demand purchases of the sex tape have increased 80% since Sunday night. This is the biggest increase since her marriage to  Kris Humphries. The VOD, online, or DVD has  steadily increased every month since Kanye and Kim hooked up last Spring.