(PILA)

1 A choice of law must be agreed in writ­ing or res­ult with cer­tainty from the pro­vi­sions of a mar­it­al agree­ment; in all oth­er re­spects, it is gov­erned by the chosen law.

2 A choice of law may be made or amended at any time. A choice of law made after the cel­eb­ra­tion of mar­riage has ret­ro­act­ive ef­fect as of the cel­eb­ra­tion date, un­less the parties agree oth­er­wise.

3 The chosen law re­mains ap­plic­able as long as the spouses have not amended or re­voked their choice.