Who's in Once Upon A Time in Hollywood and when did he go out?

The excitement is building on Leonardo DiCaprio and Brad Pitt's He posted a snapshot of himself and his Co-star dressed in the 60's fashion on his Instagram generating thousands of fan likes.

But what is the film about?

Directed by Quentin Tarantino, the film – his ninth – was described as "a story set in Los Angeles in 1969, at the height of the Hollywood hippie."

He follows actor Rick Dalton and his longtime waterfall Cliff Booth is fighting to make the big Hollywood.

Things take a dark turn as they are neighbors with Sharon Tate – the beautiful actress of Valley of the Dolls who was savagely murdered by Charles Manson's followers.

Who's in the casting?

DiCaprio who plays Rick was the first actor to engage in the film, quickly followed by Pitt playing Cliff Booth.

Margot Robbie was cast as Sharon.

Also, Al Pacino is featured as Dalton's agent, Timothy Olyphant, Luke Perry, Damian Lewis, Dakota Fanning, Emile Hirsch, Clifton Collins Jr., Tim Roth, Michael Madsen, Keith Jefferson, Nicholas Hammond and McNairy Scoot.