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Kendall Jenner<\/a> hosted a wild, fun <\/span>Halloween<\/a> costume bash on Saturday, and the party featured a guest list with some serious star power.<\/span><\/p>\n The 27-year-old reality star and runway model threw her festive celebration at the iconic Chateau Marmont in West Hollywood, and welcomed a wide array of famous friends, who went all-out for the occasion.<\/span><\/p>\n The A-list guest list included <\/span>Billie Eilish<\/a>, her brother and producer, FINNEAS,\u00a0Natalia Bryant,\u00a0<\/span>Patrick Schwarzenegger<\/a>, Lizzo, and many others.<\/span><\/p>\n It was also a perfect night for couples to show off their themed couples’ costumes, including <\/span>Channing Tatum and Zoe Kravitz<\/a>,\u00a0Charli D’Amelio and Landon Barker, as well as <\/span>Machine Gun Kelly and Megan Fox<\/a>, to name a few.<\/span><\/p>\n Eilish’s Wild West ensemble was one that really captured some attention. The 21-year-old songstress was all smiles as she rocked a redheaded cowboy look, complete with cowboy hat,\u00a0blue-and-white gingham shirt, brown pants and a leather holster for her six-shooters.<\/span><\/p>\n Patrick Schwarzenegger, meanwhile, rocked a full Elvis ensemble for his costume. The young actor was joined by girlfriend Abby Champion, who rocked a silvery prom queen and old-school Walkman headphones for a ’90s Princess vibe.<\/span><\/p>\n Kravitz and Tatum, meanwhile, went for a funny film parody couples’ costume, with Kravitz rocking a white nightgown, close-cut ‘do and a chef’s knife for her <\/span>Rosemary’s Baby<\/span><\/em> costume — while Tatum wore a onesie and a bonnet, going as the film’s titular baby.<\/span><\/p>\n D’Amelio and Barker, meanwhile, kept things modern and classic by dressing up as\u00a0Romeo and Juliet from\u00a0Baz Luhrmann’s 1996 reimagining of the Shakespearean tragedy.<\/span><\/p>\n Fox and MGK went full cosplay for their outfits — basing their costumes off the anime\/manga series <\/span>Death Note<\/span><\/em>. Kelly went all out as the demonic\u00a0Ryuk, while Fox played a gender-swapped version of the series’ protagonist, Light Yagami.<\/span><\/p>\n Additionally, <\/span>Halsey and her new beau, Avan Jogia<\/a>, made a splash with their nautical looks. Halsey rocked a merfolk-inspired, siren-like costume, while Jogia gave off sailor\/pirate vibes.<\/span><\/p>\n