Does anyone know if it is absolutely necessary to have an ITIN (Income Tax Identification Number) for my spouse in order for her to apply for a I-485. I got married after my I-485 was applied for and my priority date should be current next month (FP already done) and it turns out that there is a 8-10 week backlog for processing ITIN number from the IRS (glory to the American way!) which would mean there is a risk that I could potentially get approved before I am able to add her as a derivative. Are there any other options I can pursue?