Kaley Cuoco's divorce is all about the prenup!

Los Angeles - A prenuptial agreement will determine how Kaley Cuoco and her husband end their marriage of 21 months, a court filing released on Monday shows.

The Big Bang Theory actress filed for divorce late on Friday in Los Angeles Superior Court citing irreconcilable differences, and her petition was released on Monday afternoon.

Cuoco and tennis pro Ryan Sweeting married in a New Year's Eve ceremony in 2013. They have no children together.

The divorce petition states the pair signed a prenuptial agreement in November 2013 that will dictate Cuoco's spousal support payments to Sweeting and how they will divide their assets.

The filing states Cuoco and Sweeting separated earlier this month, but it provides no further details about the break-up.

Cuoco's publicist said on Friday that the couple had mutually agreed to end their marriage.