Sales of Kim Kardashian's sex tape go up after pregnancy news

Sales of Kim Kardashian's sex tape have gone up by 80% since her pregnancy was revealed.

The reality TV star's boyfriend Kanye West announced on Sunday that the pair are expecting a child together and Vivid Entertainment - who own the rights to Kim Kardashian: Superstar which features X-rated footage of the beauty and her ex-boyfriend Ray J - report business has soared since the news was made public.

The company say the sudden surge in video-on-demand sales is the biggest since Kim'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 last spring.

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

Kim 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.