actor Kevin Costner, has taken off her wedding ring after filing for divorce on Monday.

The couple had been married for 18 years

Baumgartner cited "irreconcilable differences" as the reason for the end of their marriage

She has asked for joint custody of their three children

Cayden (15), Hayes (14), and Grace (12)

A spokesperson for Costner confirmed the news of the divorce

Costner has responded to Baumgartner's petition by also requesting joint custody of their children

An insider revealed that Costner was "stunned" by the divorce

but a friend confirmed that there were no allegations of infidelity this time around

Costner was previously married to Cindy Costner

the couple has three children together.