Like mother, like daughter -- everyone remembers how Kim Kardashian became famous back in 2007 after her 2003 sex tape with R&B singer and her then-boyfriend Ray J was leaked online. Now, a man, who claims to have an alleged video of Kris Jenner having sex, is reportedly extorting her mom and manager.

The 58-year-old thought nothing serious of the situation and thought it was a joke when the man first contacted her about a sex tape featuring her, because she would never get herself into that kind of situation. "At first, she thought it was a joke, because she knew it couldn't be real," a source said. "Obviously she would never allow herself to be taped like that! Initially, she just ignored it."

Jenner is fed up with the man constantly calling the house and believes he could even be following her. "The man has been demanding money from Kris," the source said. "If he's not paid, he claims, he'll release the tape."

"He called Kris more than one hundred times in the last seven days, from more than 100 different phone numbers," the source added. "He uses scrambled cell numbers. He called more than 25 times on Sunday alone."

As a result, although she is certain that there is no sex tape to be blackmailed, the Keeping Up with the Kardashians producer has reportedly ramped up the security measures in place around her family home in Los Angeles, even getting the police and the family's private investigator involved.