WATCH: Creepy detail at North West's ninth birthday partyThe mum of four posted a series of photos from ‘Camp North’ to Instagram, showing off her nine-year-old’s luxe accommodation and activities as she celebrated her June 15 birthday.Snaps showed black and silver balloons arranged by a private jet, which had been decked out with camp-themed goodies, and kids tents set up in a huge room.RELATED: Kourtney Kardashian's husband Travis Barker rushed to hospitalEagle-eyed fans spotted one bizarre detail on the decorations though; the tents, which were set up inside, appeared to be decorated with fake blood spatters.“The blood spattered deer tents are something,” one commented, another calling the detail “morbid”.North cuddles up in her "creepy" blood spattered tent.Kim addressed the odd choice in an Instagram Story, where she was heard saying of the unique setup: “North’s creepy wilderness birthday, it’s so cool,”Other photos from Kim showed North and friends cuddled up in the tents on tiny mattresses complete with cosy blankets and matching custom ‘Camp North’ PJs.RELATED: Khloé breaks silence on 'faked' scenes in The Kardashians finaleMeanwhile, videos showed the kids enjoying a range of outdoor activities, from wakeboarding, to traversing sky-high bridges nestled among the forest’s treetops.Among the pint-sized guests was Jessica Simpson’s daughter Maxwell, who appeared in the background of one of Kim’s snaps.North poses with Jessica Simpson's daughter Maxwell.Over on her own account, Jess wrote: “CAMP NORTH was magic! Thank you @kimkardashian for giving Maxwell the time of her life and takin’ care of my little lady on her first ‘camp sleep away’ trip! I’m comin’ next time!”She also shared snaps from the adventure,