And the wedding day didn't dissappoint.
The society couple were married in Castello di Racconigi, a grand palace just south of Turin, Italy (where they were first couple to tie the knot since 1930) with the bride looking every inch the style queen in a princess gown by Indian-American designer Naeem Khan.
The happy couple were reportedly joined by around 200 society pals at their lavish Italian celebrations, which lasted three days.
The bride, 27, donned a stunning floor-skimming ball gown, which was bang on trend with its intricate 3D floral appliqué embellishments and stunning sheer sleeves.
"I just thought it's the one time you can go all out," the stylish PR told fashion bible Tatler in the weeks running up to the big day.
On day two the bride continued her chic wedding journey in a strapless George Shobeika dress, which featured colourful pink and green floral embroidery and sparkling stone embellishments.
"Fairytale dress," the bride described the pretty gown by the Lebanese designer in an Instagram post a few days after her nuptials.
The lavish Turin celebrations were actually the couple's second official wedding of the year, the pair having tied the knot in early June.
For their London wedding, bride Alex donned yet another equally stylish gown; this time a sophisticated vintage-feel ESME VIE dress, which she paired with a beautiful Miu Miu headpiece and the now almost iconic Manolo Blahnik bridal heels (as worn in blue by fictional style queen Carrie Bradshaw for her wedding to 'Big' in the Sex and the City series).
The stylish pair have been on-off sweethearts since they were teenagers, according to Tatler.
"He was one of my first boyfriends, when I was 15 and he was 17," the bride said. "I was at Francis Holland and he was at Harrow."
"I just went up to Harrow a couple of times. My parents thought it was really inappropriate, so I used to go round the house stealing pound coins so I could take the Tube there"
Groom Carlo - who is part of "a big, well-connected" Italian family, according to Tatler - is in charge of the private members' club Albert's, in South Kensington, London, and proposed to his childhood sweetheart while they were on holiday in Barbados, using a ring made from his mother's diamonds.
The couple were reportedly meant to marry in the 'stables' of the Turin estate originally, however changes at the venue meant the couple had to tie the knot in the pretty palace instead.
'It was just so... Italian,' said the groom.
Some couples just have all the luck!