Princesses Chiara and Carolina de Bourbon send fans wild with their stylish outfits as they share highlights from Monte Carlo Masters

The Monte Carlo Masters might be one of the biggest tennis championships in the world - but for fans of Princesses Chiara and Carolina de Bourbon, it was all about fashion.

The Italian Princesses delighted their social media following with the glamorous outfits they wore to the sporting event, which they shared in a joint Instagram post last night.

Their father Prince Carlo holds a claim to the now defunct throne of the former House of Bourbon-Two Sicilies, a cadet branch of the Spanish royal family. 

For her first day at the week-long tournament, Princess Carolina, 20, dazzled in a sleeveless green linen maxi dress with cut-outs around the waist.

The royal - who lives between Paris, Monte Carlo and Rome - completed her spring ensemble with a straw hat, gold angles and some beige suede espadrille wedges.

Pictured: Carolina (left) and Chiara de Bourbon pose on their first day at the Monte Carlo Masters

Meanwhile, her young sister Chiara, 19, gave a nod to the Monte Carlo Masters by wearing a mini white pleated tennis skirt.

The stylish teen paired her skirt with a preppy light blue shirt and a white cardigan slung over her shoulders. 

The royal - who has previously been romantically linked to Prince Christian of Denmark -  swept her blonde hair up into a loose bun and finished off her look with some trainers and gold earrings.

What's more, the sisters looked equally glam when they returned to the event on Friday evening.

On this occasion, Chiara opted for a red-and-white pinstriped shirt which she tucked into a denim midi skirt with a thigh-high slit.

The royal matched her shirt with a red cap and also wore the same beige espadrille wedges she'd debuted in previous days.

Carolina looked just as glam in a pair of flared grey jeans, pink shirt and black pointy boots.

The sisters posed for photos outside the courts and playfully played a game of tennis with oversized rackets. 

Chiara (right) opted for a red-and-white pinstriped shirt which she tucked into a denim midi skirt with a thigh-high slit.

For her first day at the week-long tournament, Princess Carolina (left), 20, dazzled in a sleeveless green linen maxi dress with cut-outs around the waist

The post has amassed almost 10,000 'likes' and fans were full of praise for their glamorous ensembles.

One gushed: 'Always elegance, great class. It's so rare these days.'

'So sophisticated and elegant,' another added. 'What grace.' 

'Your outfits are beautiful,' a third said. 

'Very elegant girls as always,' a fourth said.

Last year, Chiara shut down rumours of a romance with Prince Christian of Denmark.

Their outing comes after Chaira was forced to squash rumours that she was dating Denmark's future king, 18-year-old Prince Christian, the son of King Frederick X and Queen Mary

Chiara told Italian paper Corriere: 'We've known each other since we were little, my father Carlo is godfather to his younger sister.'

But it was her hint that she 'hopes to meet Queen Margrethe soon' which sent rumours of an engagement into overdrive.  

The two princesses regularly share snaps of their glamorous lifestyles on Instagram, posting pictures from destinations around the globe, from Paris to Dubai and New York.

As Chiara is the younger sibling, she will not inherit her father's title and duties, or his claim to Head of the House of Bourbon-Two Sicilies - they will go to older sister Maria Carolina, Duchess of Calabria and of Palermo (or Carolina for short).