The X-rated footage allegedly features the 32-year-old reality TV star and her ex-boyfriend Ray J engaged in erotic acts which are even steamier than their first home video which leaked in 2007.
"It''s definitely Kim in the video. And it's even raunchier than her last one. There are all kinds of eye-popping moments,” a source told the Daily Star newspaper.
Kim is said to be terrified the latest sex tape will appear online and cause problems in her relationship with 35-year-old rapper Kanye West.
The source added: "Kim fears this will damage her relationship with Kanye West." Kanye was involved in his own sex tape scandal in September when a 20-minute recording surfaced featuring him and a girl who looks just like Kim.