Stephen King's IT breaks September Monday record at the box office

BILL SKARSGÅRD as Pennywise in New Line Cinema's horror thriller "IT," a Warner Bros. Pictures release.

Stephen King's creepy clown movie IT has added another U.S. box office record to its haul after securing the biggest September Monday take in history.

The film, starring Bill Skarsgard as horror clown Pennywise, picked up a handful of box office feats upon its September 7 release, and now it can add another, according to

The film raked in $8.8 million at the box office on Monday. It will be the highest grossing Stephen King movie of all-time at the U.S. box office.

The Andy Muschietti-directed film also now owns the record for the best opening day ever for a horror title, the highest pre-show for a horror film and for an R-rated movie, and the highest three-day opening record weekend for the genre.

It's also the second-highest opening for an R-rated film ever - behind Deadpool.

It is now well on its way to becoming the most successful of all 33 Stephen King movie adaptations - after just four days, the movie has grabbed a total of $132.2 million - that's just over $4 million less than 1999's The Green Mile.

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