"Kanye glosses over his dirty-dog past, but he has a long list of former conquests — including groupies, exotic dancers, students video vixens and cocktail waitresses," a source told OK!.
Now, "Kim is obsessed with the idea that there's a child out there who's going to come after his fortune."
Another reason for so much anxiety? Kardashian, 34, is terrified that her hubby's ex, Amber Rose, will tell all West's secrets in a memoir coming out later this year.
Rose, 31, certainly has the motivation to spill the beans on her 37-year-old rapper ex. Rose has claimed that she and Kanye were still together when he and Kardashian started hooking up, and she recently slammed the reality star's sister, Kylie Jenner, for dating a much older man.
"Kim worries the worst is yet to come in their feud," says the source.
Check out what else the Kardashians are up to this week:
Watch: Kanye West Raps About Kim Kardashian