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You know fall is here when Gwen Stefani starts bundling up! Then again, she's also trying to keep her growing baby bump under wraps, so that could be part of it...

On Tuesday Gwen and her youngest son Zuma were out and about in Los Angeles, and from the smile on her face to her 5-inch heels, the No Doubt front woman looked oh so fab! Then again, when does she ever get it wrong when it comes to her style?

In other news, Gwen has teamed up with OPI and she'll be releasing her first nail polish collection in January of 2014. The Gwen Stefani by OPI collection will feature seven limited-edition shades, including Over & Over A-Gwen (a bold red “that pays homage to Gwen’s signature lipstick”), Hey Baby, In True Stefani Fashion, 4 in the Morning and Love.Angel.Music.Baby.

OPI executive vice president and artistic director Suzi Weiss-Fischmann says she and Stefani were inspired by the “Punk: Chaos to Couture” theme of this year’s Metropolitan Museum Costume Institute gala. Fischmann added in a statement, “With her expertise as a singer, songwriter and designer, who better to collaborate with than Gwen Stefani? Known for her trademark red lips, bold eye makeup and nail art, Gwen uses beauty to accessorize her style.” We couldn't agree more!