Actress Tammy Lynn Michaels says she was “blindsided” by Melissa Etheridge's filing for dissolution of their California domestic partnership.

Etheridge reportedly filed paperwork to end their partnership on Friday, according to celebrity website TMZ. The women announced their split in April.

In the documents, the Grammy-winning singer cites “irreconcilable differences” and asks for joint custody of the couple's two children, son Miller and daughter Johnnie Rose. Michaels gave birth to the twins in October 2006.

Etheridge,48, shares joint custody of two children – Bailey, 13, and Beckett, 11 – from a previous relationship with Julie Cypher.

The couple exchanged vows in Malibu, California in 2003. They reportedly attempted to marry during the 2008 June-to-November window when gay marriage was legal in California.

Eheridge has said her breakup with Michaels was mutual.

But in a poem titled Blindsiding posted on her blog Saturday, thirty-five-year-old Michaels asks if blindsiding is art for Etheridge. “SMACK!!!! FILE FOR DIVORCE!!!! even though we both promised; agreed; handshook; pinkyswore; no filing until after tour; in the fall; her broken promises; told to me by; headlines.”

“Could you stop blind sighting me?” she asks, then adds, “Unless it's another art form you're working on?”