Deborah Siwik, the step-mother of porn star Joslyn James -- the woman who claims that she was impregnated by Tiger Woods -- has exclusively told RadarOnline.com that James is a “compulsive liar.”

James -- who’s divorced and has a 10-year-old son with her ex -- has claimed that she got pregnant twice during a three year affair with Tiger Woods; she says one of the pregnancies ended in a miscarriage, the other because of an abortion.

On Inside Edition on Monday, the porn star claims the pair did not practice safe sex during their relationship -- although she did not tell Woods about her alleged pregnancies.

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• Deborah Siwik
• exclusive
• Inside Edition
• Joslyn James
• Las Vegas
• Tiger Woods