Michaels gave birth to a boy Miller Steven and girl Johnnie Rose on Tuesday local time.

"Tammy and the babies are in excellent health, " Etheridge said on her website. The babies were conceived using an anonymous donor from a sperm bank.

"The creation of life brings about immeasurable love, and pours hope into the future. The joy will help carry us through our upcoming sleepless nights, " the couple said in a statement.

Etheridge, 45, and Michaels, 31, held a commitment ceremony in 2003. The Grammy-winning singer has two children from her relationship with former partner Julie Cypher: daughter Bailey Jean and son Beckett. Cypher had the children through artificial insemination using a sperm donation from rock legend David Crosby, a former member of the Byrds and Crosby Stills Nash and Young.

Etheridge was diagnosed with breast cancer in 2004, but is now cancer-free. She last released a greatest hits album titled The Road Less Traveled.

Michaels starred on the 2005 NBC television comedy Committed and has appeared on Showtime's The L Word.