It's all over breast milk -- or at least stickers bearing the question, "Got Breastmilk?"

California claims the sticker company is illegally coppin' a feel on their most famous trademark, "Got Milk" -- a trademark that was created by the California Milk Processor Board.

Now, CA has filed a lawsuit against the sticker pimps in federal court in Los Angeles, demanding they stop using the breast-enhanced milk slogan and "surrender all the stickers bearing the breastmilk phrase."