Hollywood heavyweights Leonardo DiCaprio, Brad Pitt, Quentin Tarantino, and Al Pacino united as they continued filming scenes for their showbusiness themed drama on Sunday.

The stars were working on the new Quentin directed movie Once Upon A Time In Hollywood, which is about a former Western star, his stunt double, and their struggles to find entertainment work in 1969.

Leonardo, 43, plays former Western star Rick Dalton, while Brad, 54, stars as his longtime stunt double, Cliff Booth.

Hollywood heavyweights! Leonardo DiCaprio, Brad Pitt, Quentin Tarantino, and Al Pacino united as they continued filming scenes for their showbusiness themed drama on Sunday

The co-stars were already dressed in character as they got to work on set.

And they were clearly excited to see each other, sharing a playful embrace as they chatted with their director.

Leonardo wore a leather jacket and beige slacks, while Brad sported a jean jacket and denim trousers.

Quentin was cracking up as he chatted with Leonardo, laughing in between chatting with the stars.

What a crack up! Quentin couldn't stop laughing as he chatted with his stars

Greetings! Al Pacino shared an embrace with his co-star

Man of style: Dressed in character, Pitt wore a jean jacket, denim trousers, and suede shoes

Leonardo even shared a hug with Al Pacino, pulling the Oscar winning actor close as the stars prepped for another day on set.

The Godfather actor was outfitted in a sharp grey suit, blue shirt, and glasses.

Set against the backdrop of the Manson Family murders, the film sees Brad and Leo play Hollywood has-beens looking for a way back on top in the 1960s.

Sharing his vision: Tarantino appeared to be walking Leonardo and Pitt through his day

It's all good! Pitt and Leo shared a silly hug in front of their director

Look who's here! Al Pacino emerged from his car, dressed in a dark blue suit, shirt, and tie

DiCaprio and Pitt respectively play a 'former star of a western TV series, and his longtime stunt double,' Deadline quoted Tarantino as having explained to Sony.

'Both are struggling to make it in a Hollywood they don’t recognize anymore. But [DiCaprio's character] Rick has a very famous next-door neighbor…Sharon Tate.'

Manson Family members Charles 'Tex' Watson, Susan Atkins and Patricia Krenwinkel butchered Tate at her and her husband Roman Polanski's Los Angeles home in August 1969 - leaving the word 'PIG' scrawled on the front door in Tate's blood.

New roles: DiCaprio and Pitt respectively play a 'former star of a western TV series, and his longtime stunt double,' Deadline quoted Tarantino as having explained to Sony

Buttoned up: The Titanic actor rocked a smart button-up leather jacket

Hitting his stride: Pitt made his way about the set in his suede boots

In the house with Tate, who was pregnant, were coffee heiress Abigail Folger, Folger's beau Wojciech Frykowski, and Tate's hairstylist friend and ex Jay Sebring.

All of them were killed as well - as was Steven Parent, 18, who had swung by the premises that evening to pay a call on its caretaker Bill Garretson, 19. Fortunately for Garretson, the Manson Family never came across him.

The next night, Manson Family members entered the home of grocer Leno LaBianca and his wife Rosemary LaBianca, and murdered them too.

Charles Manson himself served life in prison and only died this past November, exactly a week after his 83rd birthday.

Margot Robbie stars as the late Sharon Tate in the film.