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OK

Mmmmm, pizza!!!!!!
Sure, no problem with freezing it.
When I reheat pizza, I stick it in the microwave to heat it up, and then in the toaster oven or oven to crisp it up. I find that way, it doesn't get over-cooked and burned in the oven because it's already warm from the microwave.
Freezing should be fine. I would reheat it in a toaster oven or oven so it is not soggy when you are going to eat it.