For the occasion, Kate wore a short-sleeved green print dress by Sandro Paris with her favourite pair of espadrilles. Despite the Queen reportedly disliking wedges, the mother-of-three has been spotted wearing the comfortable shoes on numerous occasions this year, most recently last week at the Royal Photographic Society where she wore a paisley printed dress.
Kate's midi-length dress, which clinches at the waist, is currently on sale on the brand's website for 30 per cent off, down from $540 to $378. The popular French label, which only launched an Australian online store in April of this year, is a favourite of Gigi Hadid, Reese Witherspoon and even Kate's sister, Pippa Middleton.
Of course, with the Kate Effect, it likely won't stay that way for long, so get in quick.
There's nothing like a sale to get you shopping for a summer wardrobe in the middle of winter. Thank us - or curse us - later.
WATCH: Kate Middleton Visits The Royal Photographic Society