James McAvoy and Jessica Chastain share first images from the set of It: Chapter 2 as filming begins

Published: 00:36 BST, 29 June 2018 | Updated: 00:41 BST, 29 June 2018

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The Losers' Club is all grown up.

James McAvoy and Jessica Chastain shared the first glimpses at It: Chapter 2 on Thursday.

The 39-year-old Scottish actor is set to play the adult version of Bill Denbrough, played by Jaeden Lieberher in the first film.

First look: Jessica Chastain shared the first glimpses at It: Chapter 2 as filming began on Thursday. She posted mashup up of her own face and Sophia Lillis

He took to Instagram to post a series of behind-the-scenes black and white Polaroids of himself with his fellow cast members, including Bill Hader, Isaiah Mustafa, James Ransone and Jack Dylan Grazer, as well as Chastain and Lieberher.

'Snapped IT. #itmovie #thedisapearanceofthemoviesweshot #itmovie' he captioned it, finishing with a little balloon emoji.

Jessica meanwhile shared a mashup up of her own face and Sophia Lillis', between them they play the old and young Beverly Marsh, respectively.

Crew: James McAvoy took to Instagram to post a series of behind the scenes black and white Polaroids of himself with his fellow cast members, including Bill Hader, Isaiah Mustafa and James Ransone, and Jack Dylan Grazer as well as Chastain and Lieberher

Squad: Jaeden Lieberher shared a group shot of the original Losers Club, as all seven youngsters crammed in for a pic he summed up as 'chaos'

She captioned hers simply: 'DAY 1 ✔ #BeverlyMarsh #ITmovie'

Jaeden also shared a group shot of the original Losers Club, as all seven youngsters crammed in for a pic he summed up as 'chaos'.

In the follow-up, SNL star Hader is set to play the grown-up version of Richie Tozier, played by Stranger Things' Finn Wolfhard in part one.

Bill Skarsgård will reprise his role as the Pennywise the Dancing Clown.

Grown ups: James McAvoy will play the adult Bill Denbrough, while Bill Hader will play the older version of Richie Tozier,

Kids: Lieberher played the young Bill Denbrough in the first film, while Richie was played by Stranger Things' Finn Wolfhard

Snap: Chastain and 16-year-old Lillis between them play the old and young Beverly Marsh, respectively

Like the Stephen King Novel it is based on, and the classic 90s miniseries, the story is told in two halves, chronicling the Lucky Seven's encounter with Pennywise as children, then as adults.

The 2017 film grossed over $700million, multiplying its $35million budget by 20.

It remains the highest grossing horror film ever, and second-highest R-rated movie, behind another unkillable clown, Deadpool.

It: Chapter 2 floats into theaters on September 6, 2019.