Looks like Dre kept at least one copy...
From Radar Online
Dr. Dre revealed he cut off contact with his ex-wife Nicole Young after he claims she falsely accused him of abuse in court, saying he realized that he "did not know the woman I had married and loved."
He claims before they got married Nicole signed a premarital agreement. Dre says they were both represented by lawyers. The deal said any property acquired in both of their names would be community property and any earnings during marriage shall be separate property of the earning spouse.
Dre also submitted a copy of the prenuptial agreement he is demanding be enforced.In the motion Dre also claims he found out his wife filed for divorce through the media.