Kaia Gerber and Finn Wolfhard round out the cast of SNL 1975

Kaia Gerber, Finn Wolfhard and Andrew Barth Feldman have been added to the cast of 'SNL 1975'.

The trio have boarded the movie based on the real-life behind-the-scenes accounts of the very first episode of 'Saturday Night Live' from director Jason Reitman.

Kaia will play the role of Jacqueline Carlin, Wolfhard is to play an NBC page and Feldman is set to star as Neil Levy.

The film tells the true story of what happened behind the scenes in the lead-up to the first broadcast of NBC's 'Saturday Night Live' in 1975 as a troupe of young comedians and writers changed TV forever.

Gil Kenan has penned the screenplay - which is based on interviews that have been conducted with all the living cast members, writers and crew on the famous series.

Other cast members include Gabriel LaBelle as 'SNL' creator Lorne Michaels and Dylan O'Brien and Cory Michael Smith as comedians Dan Aykroyd and Chevy Chase respectively.

Kaia – the daughter of supermodel Cindy Crawford and businessman Rande Gerber – has acting experience with roles in 'American Horror Story' and 'Bottoms' and explained that it has been a passion of hers since she was a child.

The 22-year-old star previously told Grazia: "I was very young when I first realised I wanted to pursue acting. I was always in school plays and musicals. My first play was 'The Wizard of Oz', I was ten and I played a tree.

"It ran for two weeks and my parents came to see almost every show, bless their hearts. I'm very grateful that now I can give them some more entertaining content to watch! Something a little more up their alley."