Val Kilmer's kids Mercedes and Jack attend photocall for their father's film at Cannes Film Festival

Val Kilmer’s children Mercedes and Jack put on a stylish display as they attended the photocall for their father’s eponymous documentary at Cannes Film Festival on Wednesday.

While actor Jack, 26, looked smart in a black blazer and white shirt teamed with jeans, his sister, 29, was glamorous in a flowing black gown teamed with a dramatic black cape.

The film star duo appeared in great spirits as they celebrated 61-year-old Val’s documentary, which focuses on the daily life of the Top Gun star and features never-before-seen clips spanning 40 years. 

Offspring: Val Kilmer’s children Mercedes and Jack put on a stylish display as they attended the photocall for their father’s eponymous documentary at Cannes Film Festival on Wednesday 

Mercedes, who has starred in films such as Paydirt and Prettyface, beared a striking resemblance to her actress mother Joanne Whalley, 59, who divorced Val in 1996. 

The beauty wowed in a one-shouldered gown which featured a single spaghetti strap and ruching at the chest.

Her look was elevated by a billowing cape detail tied at her neck, with Mercedes added a towering pair of black heels. 

The siblings were without their Batman forever star father, who is slowly recovering from throat cancer.

Pose: While actor Jack, 26, looked smart in a black blazer and white shirt teamed with jeans, his sister, 29, was glamorous in a flowing black gown teamed with a dramatic black cape

Instead, the pair posed for several snaps with the film’s Directors Ting Poo and Leo Scott. 

Meanwhile, Val’s upcoming documentary Val sees the actor using a voice box device to speak, as he talks openly about his slow recovery from throat cancer.

In a teaser for the Amazon Prime feature, the actor is heard saying ‘I’ve tried to see the world, as one piece of life’ as he presses down on the electronic tool.

Fun times: The film star duo appeared in great spirits as they celebrated 61-year-old Val’s documentary, which focuses on the daily life of the Top Gun star and features never-before-seen clips spanning 40 years

Lookalikes: Mercedes, who has starred in films such as Paydirt and Prettyface, beared a striking resemblance to her actress mother Joanne Whalley, 59, (right) who divorced Val in 1996

A voice box device is most commonly a battery operated machine that produces sound to create a voice, and is used to help those suffering with throat cancer communicate.

The emotional documentary shows the actor – who was diagnosed with throat cancer in 2014, and went public with it in 2017 after initially denying he was ill – breaking down in tears as he discusses his health battles.

‘I was recently diagnosed with throat cancer,’ an actor’s voice is heard narrating the footage. 

That’s my girl: The siblings were without their Batman forever star father, who is slowly recovering from throat cancer (Val, pictured with Mercedes in 2019)

Stunning: The beauty wowed in a one-shouldered gown which featured a single spaghetti strap and ruching at the chest

Looking good: Jack and Mercedes pulled a number of faces as they posed and interacted with the crowd

Style: Jack and Mercedes dressed to impress as they represented their actor father at the event

Feature: Val made its world premiere Wednesday at the Cannes Film Festival, and will be released first in theatres on July 23 and on Amazon Prime on August 3

‘I’m still recovering, and it is difficult to talk and be understood. But I want to tell my store more than ever,’ he adds.

Kilmer – who is a devout Christian Scientist – also says about his life: ‘I have behaved poorly, I have behaved bravely…. bizarrely to some.’

The documentary starts with video footage of the actor in his younger years, as some of his classic films like Top Gun, Heat and Batman Forever are flashed on the screen.

All together now: The pair posed for several snaps with the film’s Directors Ting Poo [far right] and Leo Scott

Close: The siblings shared a hug as they posed for snaps

Good spirits: The duo smiled and waves for the cameras

Fantastic four: Mercedes, Jack, Leo and Ting posed for snaps

Hey guys: Jack and Mercedes flashed dazzling smiles at the swanky photocall

Kilmer then explains how he was one of the first people in his social circle to own a video camera, and has shot thousands of hours of footage throughout his life.

A-List actors like Sean Penn and Kevin Bacon can been seen in the footage, which Bacon overheard saying, ‘This is really cool Val.’

The Top Gun star first revealed his cancer diagnosis during a 2017 Reddit AMA session to promote a film, after a fan referenced the fact that Michael Douglas had let slip in 2016 that he was ill. 

‘It’s difficult to talk and be understood’: Val uses a voice box to discuss throat cancer recovery as he breaks down in tears over health battle in emotional trailer for documentary Val

Emotional: The actor is seen breaking down in tears at one point, after saying ‘I’ve tried to see the world, as one piece of life.’ 

Opening up: Footage from the documentary shows the actor going about his daily life as he recovers from throat cancer 

Home footage: The documentary promises to show hours of previously unseen footage from the actor’s life 

He underwent a tracheotomy as a result of the disease several years ago, and though communication has now become difficult, last year in an interview he insisted it’s just like any other challenge has he had to tackle. 

‘I’m doing great. I feel a lot better than I sound,’ Kilmer told Good Morning America in an interview which aired last August. 

Kilmer previously told the morning show he ‘healed quickly’ from cancer, and now uses the tracheotomy to help him breathe due to the swelling of his throat glands. 

He also detailed his health struggles in his 2020 memoir I’m Your Huckleberry.