Beatrice Borromeo parties with her future in-laws at Monaco's Rose Ball

hellomagazine.com

Bride-to-be Beatrice Borromeo joined Monaco's royal family at the 61st Rose Ball on Saturday night, marking the last time she would attend the annual event before the family officially become her in-laws. The Italian beauty, who is engaged to Pierre Casiraghi, joined her fiancé, his mother Princess Caroline, sister Charlotte Casiraghi and uncle Prince Albert at the glittering soirée.

For the event 29-year-old Beatrice sported a dazzling silver gown and wore her golden locks in lose waves, displaying a stunning diamond necklace and matching earrings.

CLICK ON PHOTOS FOR FULL GALLERY

><img alt=VIEW GALLERY

Beatrice is close Pierre's elder sister Charlotte Casiraghi



The Newsweek journalist and her future husband then hit the dancefloor, showing off their moves with 28-year-old Charlotte and singer Lily Allen, who provided the evening's musical entertainment.

Charlotte, who welcomed her first son Raphäel in December 2013, looked as chic as ever in a sequinned pink and black dress. The equestrian star's comedian partner Gad Elmaleh, who is father to one-year-old Raphäel, was unable to attend.

Completing the royal party were the principality's monarch Prince Albert and his elder sister Princess Caroline, who annually step out at the event to support their late mother's Princess Grace Foundation. Once again Chanel maestro Karl Lagerfeld joined the royals, choosing to wear black trousers, a black suit jacket as well as his trademark sunglasses.

><img alt=VIEW GALLERY

Charlotte and Beatrice let their hair down on the dancefloor with singer Lily Allen



Notably absent from the event, who was held in Monte Carlo, were Princess Charlene, who was taking care of her newborn twins Prince Jacques and Princess Gabriella - the latter of whom has been feeling under the weather recently according to local media outlets.

Pierre's older brother Andrea Casiraghi and his wife Tatiana Santo Domingo also missed the ball as they are awaiting the imminent arrival of their second child.

><img alt=VIEW GALLERY

The ball is held in honour of the Princess Grace Foundation



It had been speculated that heavily pregnant Tatiana would opt out of proceedings as HELLO!'s sister publication HOLA! reported on Friday that a source said the 31-year-old will give birth in the next "five or ten days".

Tatiana, who wed her long-term love Andrea in August 2014 after seven years of dating, is already mum to two-year-old Sascha.