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Gwen Stefani has been hitting the recording studio hard ... working on the new No Doubt album. So exciting!

The blonde beauty, rocking head to toe black, signature red lips and a leather sleeveless shirt, looked picture perfect while out running errands. We're glad the "Just A Girl" singer toned down that massive mom hair she was sporting yesterday.

Click thru to see Gwen holding on tight to her hubby Gavin.