First she took off the ring, and then she signed the divorce docs! Kaley Cuoco definitely isn't looking back on this one...

The Big Bang Theory actress has officially filed for divorce from her husband of 21 months, Ryan Sweeting. Cuoco cited irreconcilable differences, and according to the filing, a prenuptial agreement was signed by the pair in November 2013, just one month before they got married on New Year's Eve.

On Friday the 29-year-old star's rep said in a statement, "Kaley Cuoco and Ryan Sweeting have mutually decided to end their marriage. They ask for privacy at this time. No further statement will be issued regarding this matter."

When Cuoco appeared on Watch What Happens Live! on September 20 she gave no hints that the couple were headed for a split, but according to court docs, the duo separated on September 3.

"The few times Kaley and Ryan were out together, the tension was noticeable," a source recently dished to People. "You could tell the honeymoon phase had ended. They both seemed miserable."

Wonder what went wrong?