Kim Kardashian's sex tape sales go up 80% after pregnancy announcement

The reality TV star's boyfriend Kanye West announced on Sunday that the pair are expecting a child together and Vivid Entertainment report business has soared since the news was made public.

Vivid Entertainment own the rights to 'Kim Kardashian: Superstar' which features X-rated footage of the beauty and her ex-boyfriend Ray J.

The company say the sudden surge in video-on-demand sales is the biggest since Kardashian's 2011 nuptials to Kris Humphries.

Additionally, they told TMZ that sales of the erotic material - on DVD, online and video-on-demand - have increased steadily every month since the 'Keeping Up With the Kardashians' star started dating Kanye West last spring.

The tape - which was made in 2003 - was leaked online in 2007.

Kardashian sued Vivid Entertainment for ownership of the tape - which was allegedly stolen during a house move - after they paid $1 million for the rights but in April 2007, she dropped the case and settled with the company for $5 million.