There are two schools of thought on this one. I don't have my sources handy, but I can tell you that both are acceptable. It's mostly a matter of personal preference. I use the comma prior to "and" when separating two independent clauses, but not in a list of items. That's my preference. So, in this case, feel free to do what seems more natural to you. You will be safe no matter what.
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Sweet Momma Sue