The ceremony took place at midday on 31 August in the grounds of the Prince's Palace. No official communiqué has been issued about the wedding, except to confirm that it was taking place and protocol would be kept to a minimum. This is in keeping with the laidback, informal approach to life favoured by the couple who are parents to a baby son named Sacha.
After the ceremony it was time for the newlyweds and their 400 guests to celebrate.
Andrea and Tatiana were joined by the likes of Greek shipping heiress Eugenie Niarchos, the Missioni fashion family and Tatiana's influential New York-based siblings for an al fresco lunch by the Palace pool.
To make the celebrations even more special six barrels of beer straight from the Brasserie de Monaco were delieved. One picture, posted by one of the bride's close friends, shows Tatiana's brother Julio Mario Santo Domingo III enjoying a glass of the luxury beer.
Standing in the centre of the photo, Julio can be seen sporting a smart suit and sunglasses with reflective yellow lenses. Julio is surrounded by four of Tatiana's friends, who are all wearing Dolce & Gabbana dresses.
In another picture, posted by one of Tatiana's relatives Bettina Santo Domingo, more guests are seen showing off summery printed dresses and quirky sunglasses. In keeping with the relaxed atmosphere one guest sported a garland of flowers on her head.
The sunny weather, smiling faces and floral outfits all give the impression of a light-hearted joyful day that Tatiana and Andrea desired instead of a more formal royal wedding.
A special place in the bridal party was reserved for Charlotte Casiraghi, the groom's sister who introduced the pair. The royal beauty, who is thought to be about six months pregnant, attended the wedding with her partner and French screen heartthrob, Gad Elmaleh.
Last year Tatiana's best friend Margherita Missoni married in a gypsy-inspired setting, complete with acrobats, fortune tellers and painted caravans, which could have inspired mother-of-one Tatiana.