Sharon Stone, Orlando Bloom and Sarah Ferguson among attendees at glitzy Cannes party

Sarah Ferguson was spotted rocking out on the dance floor with Robin Thicke as an unlikely cohort of celebs gathered for a star-studded party in France.

An unlikely assortment of celebrities have gathered in Cannes for a glitzy charity dinner.

Among attendees at the Knights Of Charity Gala on Monday were Sarah, Duchess of York, who at one point was spotted rocking out on the dance floor with US singer Robin Thicke.

Fergie and Robin Thicke on the dance floor at the Knights of Charity Gala in Cannes. Picture: BACKGRID

Thicke was among the performers, which also included Andrea Bocelli. Picture: BACKGRID

US actor Sharon Stone hosted the gala at the illustrious Chateau de la Croix des Garde in the South of France, which was also attended by British actor Orlando Bloom, who showed up solo amid his European holiday with fiancee Katy Perry.

Orlando Bloom and host Sharon Stone. Picture: BACKGRID

The Duchess poses with Stone. Picture: BACKGRID

This year’s dress code for the event was ‘Grace Kelly & Cary Grant’, as Hollywood stars and business leaders gathered to raise money for a variety of children’s charities.

Sarah Ferguson, 64, graced the red carpet in a black-and-white gown from London label Safiyaa Kalika, which retails for $1885.

Fergie wore a black-and-white gown. Picture: Andreas Rentz/Getty Images

Meanwhile, Stone, 66, opted for a power blue spaghetti-strap dress with feathered embellishments.

Movie producer Milutin Gatsby rounded out the guest list alongside wife Helena, while Italian tenor Andrea Bocelli also performed for attendees.

It costs a fortune to attend the event, with individual seats starting at $19,000, while tables of 12 go for a minimum of $197,000.

Perry’s absence is notable, with the US pop star having been earlier spotted soaking up the sunshine in Saint-Tropez alongside Bloom.

Bloom attended solo. Picture: Andreas Rentz/Getty Images

The A-list couple were photographed enjoying a day at the beach, in photos taken just two days after Perry released her new single, Woman’s World, which was utterly panned by critics.

Further, the song has missed the top 40 in a number of countries, while failing to chart at all in Australia.

The reception doesn’t bode well for her upcoming seventh studio album 143, which is slated for release in September and comes four years after her last album, the underperforming Smile.

It didn’t help that Perry, once one of the biggest pop star in the world thanks to the success of her 2010 album Teenage Dream, had garnered widespread buzz about her comeback for several weeks.