The fairytale celebrations were a royal affair, with Theodora's siblings Princess Alexia, Crown Prince Pavlos, Prince Nikolas, and Prince Philippos attending to watch their sister glide down the aisle in a hand-beaded Celia Kritharioti wedding dress.
Equally stylish guests included Princess Olympia of Greece, who made the most stunning bridesmaid in a flowing, liquid-metallic mauve dress, while Queen Sofia of Spain captivated in a romantic red pleated gown with diamond details.
In Western culture, it is generally considered to be ill-mannered to wear any shade of white to a wedding unless specifically asked to by the bride.
Princess Theodora's niece, Amelia Morales y de Grecia, appeared to turn a blind eye to this rule, sparking a debate amongst royal style fans online.
The 16-year-old royal was seen arriving at the wedding celebrations of Princess Theodora and Matthew Kumar wearing a white satin halter gown.
Amelia accessorised with a pastel pink clutch, delicate diamond jewels and an ombré pink shawl draped across her arms.
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The dress, identified by Instagram style blog Royal Fashion Police, formerly belonged to Amelia's mother Princess Alexia, who wore the dress 23 years prior at the pre-wedding gala of Crown Prince Haakon and Crown Princess Mette-Marit.
Royal style fans were still quick to comment on the controversial choice of gown worn to the Greek royal nuptials.
"It looks white and she wasn’t the bride!" penned one fan, as another agreed: "It is a nice dress and she looks good, but is this the right colour for a wedding? It photographs like white."
While others debated if the dress was actually a pale blue, some royal fans delighted in the fact the young royal had recycled her mother's pre-wedding dress last worn two decades ago.
"This is becoming quite the trend of the new generation wearing dresses from their elders from decades ago. I like it! Both mom and daughter look very pretty," penned a royal style fan.
Amelia wasn't the only Greek royal to recycle her mother's dress for the occasion. Her sister, Ana María Morales y de Grecia, looked equally beautiful in a Champagne-hued gown embellished with a hand-beaded bardot neckline and dripping crystal detailing on the skirt.
It was last worn by Princess Alexia in 1999 at her own pre-wedding gala.