O. Mauer/Broadimage

WHAT SHE WORE The actress went for an L.A. stroll in a polka-dot dress from Alexa Chung for Madewell, booties and a Miu Miu bag.

WHY WE LOVE IT Rachel Bilson made a stylish transition to fall by adding cold-weather-ready ankle boots to a flirty summer dress. Her brown quilted bag was the perfect seasonally appropriate finish.

CELEBRITY: Rachel Bilson

TREND: Booties

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Rachel Bilson

Rachel Bilson in Alexa Chung for Madewell