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This must be one of the many reasons why Gwen Stefani always looks so happy and healthy ... not to mention hot!

On Wednesday afternoon X17 photographers snapped the preggers No Doubt front woman leaving an acupuncture clinic in Los Angeles, and she looked flawless in skinnies, heeled booties, a tweed coat and a beanie. As always, Gwen's hair and makeup looked amazing, and we love the hot pink lip color -- it's a change of pace from her usual red, but we think she should rock this shade more often!