Celebrities Post Spook-tacular Halloween Costumes Pics Tons of celebrities went above and beyond this Halloween. Here are some of the best costumes we've seen on Instagram. Ciara channels the spirit of Wakanda from 'Black Panther.' Mariah Carey and boyfriend Bryan Tanaka role played as doctor and nurse. Khloé Kardashian dressed daughter True in many different outfits, including this unicorn onesie. Sarah Hyland and Wells Adams' costume was a pun for Taco Belle. Kylie Jenner was fantastic in plastic as Barbie.