Better to tell your spouse you are afraid you may be laid off than to tell them you already were.
Start slow. Tell them things are not going well at first. Let them digest that information. Then after a day or two tell them you heard about projects likely getting canceled. Then tell them layoffs are imminent and they could affect whole divisions.
The key is to give them time to absorb the information and to realize it is not really in your hands. Unless you were JF, you could have done nothing to save yourself other than maybe leaving a few months before. If the layoffs are actully happening on the 24th, you have some time to do this.
Your spouse may be shocked at first but if you have a reasonable relationship with them, they will understand and may even support you through the tough time.
Good luck!