Polka-dot princess! Kate is radiant in Alessandra Rich dress as she arrives for Garter Day

The royal, 41, opted for a chic black-and-white spotty midi dress by Alessandra Rich for the service at St George
The royal, 41, opted for a chic black-and-white spotty midi dress by Alessandra Rich for the service at St George's Chapel in Windsor.

Polka-dot princess! Kate is radiant in Alessandra Rich dress as she arrives for Garter Day

Kate Middleton Does '80s Dressing in Alessandra Rich for Garter Day Service

Kate Middleton Style & Fashion: The Princess of Wales' Best Looks

Kate Middleton's Best Fashion Looks - Duchess of Cambridge's Chic Outfits

Polka-dot princess! Kate is radiant in Alessandra Rich dress as she arrives for Garter Day

Princess of Wales is spot on in a polka dot dress as she leads royal glamour at Garter Day

See Princess Kate's Most Stunning Fashion Moments of All Time

Kate Middleton Does '80s Dressing in Alessandra Rich for Garter Service

Kate Middleton: Why The Duchess Of Cambridge Wore Red To Introduce The New Prince

See Princess Kate's Most Stunning Fashion Moments of All Time

Polka-dot princess! Kate is radiant in Alessandra Rich dress as she arrives for Garter Day

Kate Middleton's Best Fashion Moments of All Time

Kate Middleton's Best Fashion Looks - Duchess of Cambridge's Chic Outfits

Kate Middleton's My Fair Lady inspired look at Order of the Garter

Kate Middleton's 'impractical' polka-dot dress seriously divides royal fans