Kim Kardashian may be dating New Jersey Nets basketball player Kris Humphries, but her parents have never met him.

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"She's dating a lot of different people," Kris Jenner told People magazine at a party at the winter Television Critics Association press tour in Pasadena, Calif., Tuesday. "I usually don't meet them until she gets serious and, so far, she hasn't brought him around."

Jenner said her daughter has been working too hard to get involved in a serious new relationship.

Stepfather Bruce Jenner, the Olympic gold medalist, said a relationship becomes real for him when he meets the guy.

"I only worry about the boyfriends when they show up at my house," he said. "I know if he shows up at my house, then I'll start to worry."