Kate Middleton celebrates first St. Patrick's Day as Colonel of the Irish Guards

She presented the Guards with shamrocks at the annual parade in Aldershot

Middleton wore a bespoke Catherine Walker coat dress in teal with matching pumps

She added an asymmetrical Jane Taylor London fascinator and emerald drop earrings

Middleton wore the historic gold Cartier Irish Guards Shamrock Brooch

Middleton has exclusively worn the brooch since 2011

She passed out shamrocks to attendees and added one to her own ensemble

Middleton usually wears emerald or forest green for St. Patrick's Day, except in 2015 when she opted for gray

This year's teal ensemble was an unexpected twist in the color family.