It is up to your ex-spouse to report the income as required on their tax return. As noted above, the 1099-MISC is only used for payments made in the course of a trade or business.
Tax law requires that all income not specifically exempt from taxation be reported on as income on a tax return. A form is not required for income to be listed on a tax return. Many taxpayers have cash receipts of income without specific documentation each year to report.
Since the income isn't deductible to you, no proof that you paid it is required by you, and whether or not it is reported as income by your former spouse isn't a liability for you. By that I mean, if it isn't reported on that return, you are not liable because you didn't issue a form of some sort. Only the individual who should have reported the income bears the responsibility to report it.
Your only obligation is to demonstrate that you have followed the terms of your court order, which can be done by keeping your canceled check or other proof of payment in with your other important records.
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