Melissa Etheridge to Tammy Lynn: The Settlement Sticks, Baby!

Melissa Etheridge just scored a legal victory against her former domestic partner Tammy Lynn Michaels, who was trying to get their settlement tossed out the window.

The judge in the legal war has ruled the settlement is valid and binding.

TMZ broke the story ... under the terms of the settlement ... Melissa must pay Tammy $13,000 a month in spousal support and $10,000 a month in child support. They have agreed to joint custody.

Melissa gets to keep some property in Springdale, Arizona, Hidden Hills, California, and somewhere in Arkansas.

As for Tammy, she gets 50% of the royalties from the album, The Awakening. Tammy also gets 50% from the songs, A Simple Love, All There Is, All We Can Really Do, An Unexpected Rain, California, God is in the People, Heroes and Friends, Imagine That, I've Loved You Before, Map of the Stars, Message to Myself, Open Your Minds, The Kingdom of Heaven, The Universe Listened, Threesome, and What Happens Tomorrow.