She also called Tammy Lynn "a wonderful woman and an incredible mother" and said "she'll always be in my life."
The two held a commitment ceremony in Malibu, Calif., in 2003.
Tammy Etheridge gave birth to twins - a son, Miller, and a daughter, Johnnie Rose - in 2006.
The couple announced their separation April 15.
The Associated Press contributed to this story.