Dr. Dre's Wife is Challenging Prenup in $1 Billion Divorce

Dr. Dre's wife is not getting divorced without a fight, because she's challenging their prenup and $1 billion is on the line.

Nicole Young just filed legal docs, obtained by TMZ, in which she claims she was forced to sign the prenup back in 1996.

Nicole says Dre is now worth $1 bil, and says before they tied the knot, "I was extremely reluctant, resistant and afraid to sign the agreement and felt backed into a corner. Given the extraordinary pressure and intimidation by Andre, I was left with no option but to hire a lawyer (of course, with the help of Andre's team of professionals) and unwillingly signed the agreement very shortly before our marriage."

She then says 2 years into the marriage, "Andre acknowledged to me that he felt ashamed he had pressured me into signing a premarital agreement and he tore up multiple copies of the agreement in front of me. Since the day he tore up the agreements, we both understood that there was no premarital agreement, and that it was null and void."

Sources connected to Dre beg to differ, telling TMZ, he never expressed shame over the prenup and he never tore it up or said it was invalid. Our sources also say Nicole had her own lawyer and she had a clear choice on whether to sign or not.

Our sources say Dre has made it clear ... he will pay spousal support and all her expenses, but clearly Nicole wants a big piece of the pie, claiming he amassed most of his fortune during the marriage.