And the bride wore pink! Heiress Beatrice Borromeo dons blush Valentino to wed Monaco royal Pierre Casiraghi... before changing into white for the reception

• Son of Princess Caroline, Pierre Casiraghi is seventh in line to the thone
• Family of Beatrice have owned Borromean Islands since 16th century
• Couple tied knot in civil ceremony at Pink Palace’s Salon des Glaces
• Celebrations organised by Pierre's uncle Prince Albert of Monaco 
• Glamorous guests arrived for lavish dinner at luxurious Hôtel de Paris 

By MAYBELLE MORGAN FOR MAILONLINE

Monaco royal Pierre Casiraghi and Italian aristocrat Beatrice Borromeo tied the knot in a lavish Monte Carlo ceremony on Saturday.

The grandson of Grace Kelly, 27, and the 29-year-old model and heiress, who have been together for seven years, wed in the luxurious Salon des Glaces in the Pink Palace.

Posing for pictures on the balcony in her stunning pink and gold lace Valentino gown, Beatrice later changed into a floor-length white evening gown for that night's festivities at the five-star Hôtel de Paris.

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Valentino released this picture of the newlyweds, revealing they were behind the pink and gold lace gown

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Beatrice (right) and Pierre Casiraghi, 27 (second left), arrived in a Rolls-Royce for their wedding reception at Monaco's Hôtel de Paris

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Blushing bride: Italian heiress, Beatrice Borromeo, 29, looked every inch a fledgling princess in a stunning floor-length backless gown

The civil ceremony itself was a relatively intimate affair, attended by 70 guests and taking place in the reception room reserved for the reigning sovereign's official family functions at the distinctive salmon-pink Prince's Palace.

Beatrice wore a stunning blush floor-length Valentino Haute Couture dress designed by creative directors, Maria Grazia Chiuri and Pierpaolo Piccioli.

The designers posted a picture of Beatrice wearing the romantic chiffon gown with gold lace on its Instagram feed as she gazed into the eyes of her new husband, who is seventh in line to the throne.

The Borromeo family have a close ties with the House of Valentino - with her sisters also opting for Valentino for their weddings.

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Pierre Casiraghi is the seventh in the line to the throne and also Grace Kelly's grandson

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Beatrice looked every inch the glowing bride as she arrived with husband Pierre (left) and greeted guests at the Monte Carlo venue

Close family and friends, including Pierre's uncle Prince Albert and the groom's mother Princess Caroline, were later joined by approximately 500 additional guests for a garden party in the grounds of the medieval grounds.

Taking to the opulent Monte Carlo venue, Hôtel de Paris in the evening, guests were seen arriving in suits and floor-length gowns to continue the celebrations.

Beatrice, who is the longtime girlfriend of the Monegasque royal, is a member of the ancient aristrocratic House of Borromeo - a family that has owned the Borromean Islands in Italy since the 16th century.

The blonde beauty changed into a stunning white evening dress for the reception, scraping her hair back into a bun, and sporting minimalist jewellery to let the lavish gown do all the talking.

The floor-length glitzy dress featured a dainty racer-front, but the real talking point was the risqué back, held up by two barely-there cross-back straps.

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Guests pulled out all the stops as they arrived in glamorous cocktail attire for the wedding reception

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Male guests opted for tuxedos, while ladies wore a selection of lavish gowns and jewellery

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Celebrations: Guests looked in high spirits as they arrived in a series of stylish outfits

As guests arrived at the lavish 187-room venue, attire varied from jaw-dropping floor-length gowns, to shorter summer dresses and sandals.

Male guests stuck to fail-safe tuxedos, with one gentleman even opting for a fashion-forward scarlet jacket and black trouser combo.

Pierre Casiraghi is the 27-year-old son of Princess of Hanover, Caroline, and the late Stefano Casiraghi.

Older brother and fourth in line to the throne, 31-year-old Andrea Casiraghi, tied the knot in a similarly lavish wedding back in 2013, to 31-year-old socialite, Tatiana Santo Domingo. 

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Fashion-forward: One male guest opted for a scarlet tuxedo jacket and dark trouser combo

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Other friends and family arrived in slightly less formal, but equally stylish outfits

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The evening celebrations at the 187-room hotel would have been a social highlight of the Monaco season

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Passers-by seemed aware of the momentous royal wedding and were seen strolling by the venue

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Monte Carlo's lavish 187-room Hôtel de Paris is situated by the sea front on the French Riviera

The royal couple began dating back in May 2008, while attending Milan's Bocconi University together. 

According to The International Business Times, the ceremony will be followed by a more lavish, religious wedding in Italy - in the bride's native Borromean Islands.

HISTORY OF THE ROYAL HOUSE OF MONACO 

• The House of Grimaldi has ruled the tiny sovereign state of Monaco on France’s Mediterranean Coast for over 700 years.
• Actress Grace Kelly, known for screen classics such as Rear Window (1954) and To Catch a Thief (1955), married Monaco's Prince Rainier III in 1956 and abandoned her illustrious acting career to become Her Serene Highness The Princess of Monaco.
• The royal couple had three children: Princess Caroline, 58, Prince Albert, now 57, and Princess Stéphanie, now 50.
• In September 14, 1982, tragedy struck when Princess Grace and youngest daughter Stéphanie were involved in a car accident which cost Princess Grace her life at the age of 52. Princess Stéphanie survived with minor injuries.
• Currently, the reigning monarch of Monaco is Albert II, the 57-year-old son of the son of Rainier III, Prince of Monaco, and the American screen icon Grace Kelly.
• Prince Albert II married Princess Charlene, 37, a former Olympic swimmer for South Africa in 2011.
• Leading up to the wedding, the couple were plagued by negative reports of infidelity on the Prince’s side, which have since been revealed in interviews by the Princess as ‘categorical lies’.
• The pair now have seven-month-old twins together, Jacques and Gabriella.
• The youngest daughter of Prince Rainier III and Princess Monaco, and tenth in line to the Monégasque throne, Stéphanie, has previously been known as the ‘wild child’ of Monaco, partying across Europe and dating a succession of men in her youth.
• She married bodybuilder Daniel Ducruet in 1995, who she divorced a year later, and went on to marry acrobat Adans Lopez Peres, in 2003, also divorcing a year later.
• The oldest of Grace Kelly and Prince Rainier II, is Caroline, also the mother of 27-year-old recent groom Pierre Casiraghi. Princess of Hanover, Caroline, 58, has had a similarly rocky time when it comes to relationships.
• Caroline split from first husband, Parisian Banker Philippe Junot, in 1980, after a short marriage of two years.
• Just three years later she went on to marry Italian socialite Stefano Casiraghi; the pair going on to have three children together Charlotte, 28, Andrea, 31, and Pierre Casiraghi, 27.
• Tragedy struck and Stefano Casiraghi was killed in a speed-boating accident in 1990, at only 30 years old.
• Caroline went on to marry again, nine years later, to Prince Ernst August of Hanover, Duke of Brunswick.
• But In 2009, it was reported that Caroline had separated from Ernst August and had returned to live in Monaco, following scandalous images emerging of Ernst August kissing a woman who was not identified as Caroline. 

While Prince Albert and Princess Charlene attended the wedding, the couple headed off to host the 67th Red Cross Gala charity event at the grand Salle des Étoiles in Monte Carlo. 

The former swimmer put a fashionable foot forward in a sophisticated scarlet one-shouldered jumpsuit from the Valentino Resort 2015 collection, making it two for two for the Italian designer.

She accessorised with sparkling gold sandals, matching clutch bag and diamond earrings. 

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On the morning of the wedding, the couple arrived in uncharacteristically modest fashion, driving themselves to the venue

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Bride-to-be Beatrice (left) looked in happy spirits as she sat in the passenger seat with future husband, Pierre (right)

Beatrice was seen smiling in the car, while showing off a pair of dainty finger-less gloves

On the morning of the wedding, Pierre and Beatrice were seen driving to the palace, unaccompanied in uncharacteristically modest fashion.

Not yet in her stunning Valentino gown, Beatrice sporting white fingerless gloves white crochet detailing.

As guests began to arrive, they were seen making the most of the balmy weather, with some children in loafers and colourful shorts.

Older sister of the groom, Charlotte Casiraghi, 28, arrived in a red and white sleeveless dress, which served to show off her athletic figure. 

Other revellers donned woven hats to keep the heat away, with colourful sun dresses or fashionable palazzo pants. 

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The car park of the Pink Palace was full of flashy automobiles ahead of the royal wedding

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Older sister of the groom, Charlotte Casiraghi, 28, arrived in a flattering red and white dress and cream woven hat

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Charlotte Casiraghi (left) shielded her face and looked busy on the phone as she greeted other guests