750 ILCS 16/45: Husband or wife as competent witness.

In no prosecution under this Act shall any existing statute or rule of law prohibiting the disclosure of confidential communications between husband and wife apply. And both husband and wife shall be competent witnesses to testify to any and all relevant matters, including the fact of such marriage and of the parentage of such child or children, provided that neither shall be compelled to give evidence incriminating himself or herself.