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We're dying to know what Gwen Stefani has to say about the benefits of acupuncture ... does it help you lose baby weight?!

The 44-year-old No Doubt frontwoman went to her favorite needle clinic on Wednesday wearing a gangsta-inspired plaid button-down, open at the waist. And just look at her stomach!!! It's been almost four months to the day since Gwen gave birth to baby Apollo and her famous abs are already back to perfection. How does she do it?