Kate Winslet exuded elegance as she joined Benedict Cumberbatch and his spouse, Sophie Hunter, at the premiere of “Finding Harmony: A King’s Vision” held at Windsor Castle.

Set for release on Prime Video next month, the documentary chronicles King Charles III’s enduring dedication to environmental causes.

The “Titanic” star, who lends her voice as the narrator for the film, was among the notable attendees at Wednesday’s premiere at Windsor Castle.

Winslet captivated onlookers in a stunning one-shoulder black gown, adorned with striking sequin-striped panels that hugged her figure.

Benedict Cumberbatch was also present, accompanied by his wife Sophie. The couple shared a moment of affection while gracing the red carpet together.

Benedict looked dapper in a grey metallic tuxedo while his playwright wife oozed sophistication in a purple satin strapless gown.  

Kate Winslet put on a glamorous display as she joined Benedict Cumberbatch and his wife Sophie Hunter at the Windsor Castle premiere of Finding Harmony: A King’s Vision on Wednesday

Also in attendance was actor Benedict and his wife Sophie, who put on a loved-up display as they took to the red carpet

Meanwhile acting legend Judi Dench also made an appearance with her partner, conservationist David Mills.

Rod Stewart was also seen with his wife Penny Lancaster, with the rocker wearing a religious cross necklace, lace shirt and pinstripe trousers.

Penny looked incredible for the premiere in a pink and brown floral chiffon gown featuring ruffles and paired with a black velvet shawl. 

Sir Kenneth Branagh was among the stars to make an appearance, opting for a classic black suit and tie.  

Ghosts actress Lolly Adefope turned heads in a bright pink sleeveless tiered midi-dress.

She finished off her red carpet look with a pair of chunky Mary Jane shoes featuring gold buckles and drop earrings. 

Hollywood Stanley Tucci stepped out for the premiere with his wife Felicity Blunt, the sister of his Devil Wears Prada co-star Emily Blunt. 

Vlogger Louise Pentland looked glamorous in a brown mesh gown adorned with jewels and featuring a tulle skirt. 

Kate looked sensational for the event in a one-shouldered black figure-hugging gown, which featured sequin striped panels

Benedict looked dapper in a grey metallic tuxedo while his playwright wife oozed sophistication in a purple satin strapless gown

Meanwhile acting legend Judi Dench also made an appearance with her partner, conservationist David Mills

Rod Stewart was also seen with his wife Penny Lancaster, with the rocker wearing a religious cross necklace, lace shirt and pinstripe trousers

Sir Kenneth Branagh was among the stars to make an appearance, opting for a classic black suit and tie

Ghosts actress Lolly Adefope turned heads in a bright pink sleeveless tiered midi-dress

She finished off her red carpet look with a pair of chunky Mary Jane shoes featuring gold buckles and drop earrings

Hollywood Stanley Tucci stepped out for the premiere with his wife Felicity Blunt, the sister of his Devil Wears Prada co-star Emily Blunt

Kate was seen giving a speech inside the premiere for the documentary – which she narrates 

Pianist and bandleader Jools is seen speaking to rocker Rod Stewart and his wife Penny Lancaster

King Charles (Seen with Queen Camilla) said he wants to improve the planet before he dies in the documentary 

In the new 90-minute film, made in collaboration with his charity The King’s Foundation for Amazon MGM Studios, the monarch said the situation is ‘rapidly going backwards’

Broadcaster Sarah Beeny opted for a silver crushed velvet halterneck gown featured a structured bodice. 

Elsewhere author Lydia Millen oozed elegance in a black velvet square neckline A-line gown, paired with an array of pearl jewellery. 

Other TV personalities in attendance at the premiere included TV presenter and farmer Jimmy Doherty and gardener Alan Titchmarsh.

They were also joined by chef Raymond Blanc and pianist and bandleader Jools Holland. 

King Charles said he wants to improve the planet before he dies – after revealing he was ‘haunted’ by the criticism he faced over an interview in which he claimed he talked to plants.

In the new 90-minute film, made in collaboration with his charity The King’s Foundation for Amazon MGM Studios, the monarch said the situation is ‘rapidly going backwards’ – with mankind ‘actually destroying our means to survival’.

But he expressed his hope that ‘by the time I shuffle off this mortal coil’ there might be more awareness of the ‘need to bring things back together again’.

In the film, Charles can be seen collecting eggs from chickens at the ‘Cluckingham Palace’ coop on his Highgrove estate, as he reveals his love of a crispy baked potato – declaring ‘red Duke of Yorks’ are the best variety. 

Vlogger Louise Pentland looked glamorous in a brown mesh gown adorned with jewels and featuring a tulle skirt

Elsewhere author Lydia Millen oozed elegance in a black velvet square neckline A-line gown, paired with an array of pearl jewellery

Other TV personalities in attendance at the premiere included TV presenter and farmer Jimmy Doherty and gardener Alan Titchmarsh

Broadcaster Sarah Beeny opted for a silver crushed velvet halterneck gown featured a structured bodice

They were also joined by chef Raymond Blanc and pianist and bandleader Jools Holland

Actress Kate, who narrates the film, also recounts how Charles was ‘haunted’ by the criticism he faced after he said in a 1986 television interview that he talked to plants.

The documentary describes how the King, as the Prince of Wales, emerged as a key figure on the environment over the years, making regular keynote speeches, despite ‘cries from some that he should take a back seat’, Kate said.

The monarch, in new footage, added: ‘I just felt this was the approach that I was going to stick to. A course I set and I wasn’t going to be diverted from.’

After an academic commented that the world is not on the ‘trajectory’ needed to limit the worst effects of climate change, Charles remarked: ‘It’s rapidly going backwards, I’ve said that for the last 40 years, but anyway, there we are… I can only do what I can do, which is not very much – anyway.

‘People don’t seem to understand it’s not just climate that’s the problem, it’s also biodiversity loss, so we’re actually destroying our means of survival, all the time.

‘To put that back together again is possible, but we should have been doing it long ago. We’ve got to do it as fast as we can now.’

King Charles photographed in the Arboretum at Highgrove House in July 2025, by portrait photographer Millie Pilkington, for Prime Video documentary Finding Harmony: A King’s Vision

Meryl Streep (centre) and Kate Winslet (third right) watch as King Charles speaks to guests during the King’s Foundation Awards ceremony at St James’s Palace, London

He added: ‘Maybe, by the time I shuffle off this mortal coil, there might be a little more awareness… of the need to bring things back together again.’

Kate said: ‘While explaining his passion for organic gardening to the press, Prince Charles made a comment that has haunted him ever since.’

Archive footage of him describing how he talks to plants is included in the film.

Ian Skelly, co-author of the King’s 2010 Harmony book, said: ‘Those criticisms really upset him. He got treated very unfairly, seen very unfairly, and those of us that knew him better were quite upset by that.

‘It was difficult to know how to respond, but I really felt for him.’

Charles said in 1986: ‘I just come and talk to the plants, really – very important to talk to them, they respond.’