Unfortunately, as grounds for divorce, it still must be corroborated by a third party other than the two parties. Va. Code Sec. 20-99(2). This can be the paramour(s), however (assuming can get one of them to tell the truth under oath).
Atty Parks: You're right, because of the clear and convincing standard -- a party admission is not enough. See Konicki v. Konicki, 32 Va. Cir. 368, 370 (Va. Cir. Ct. 1994)
To gentleman who asked the question, note also that if you continued to cohabit with her after learning of the affair you may be considered to have "condoned" the adultery, and the bar on spousal support won't apply. If you are not represented by counsel, you need to consult with a family law attorney in your area on these matters.
Absolutely right as to condonation. I didn't think to mention that, but certainly relevant. I would echo the suggestion you consult with an attorney to fully protect your rights.