Kaley Cuoco Divorce -- Clean Break Thanks to Prenup

Kaley Cuoco's divorce from Ryan Sweeting should be settled even quicker than their brief marriage ... since they signed a prenuptial agreement.

In the divorce docs filed by Kaley on Friday in L.A. ... she cites irreconcilable differences as the reason for the split, and says they separated on September 3. They got married Dec. 31, 2013.

She also points out all property or spousal support issues are already hammered out in the prenup ... which they drafted and signed a month before their wedding.