Michaels Blindsided by "Divorce" Papers

Melissa Etheridge filed paperwork Friday in a Los Angeles court to officially dissolve her domestic partnership with Tammy Lynn Michaels, according to TMZ.

The couple announced their separation in April. The couple held a commitment ceremony in 2003 and registered a domestic partnership in August 2005.

In 2006, Michaels gave birth to twins from an anonymous sperm donor.

According to court documents, Etheridge cited irreconcilable differences as the reason for the split. She is seeking joint custody of their 3-year-old children.

Michaels took to her blog Saturday morning, writing in a poem that she felt "blindsided" by Etheridge.

"SMACK!!!!!!!!!!!!
FILE FOR DIVORCE!!!!!!
even though we both promised
agreed
handshook
pinkyswore

no filing until after tour
in the fall"

Read the full poem here.