From Inside Edition.

Heidi Klum and her husband Tom Kaulitz both dressed up as E.T. for her annual Halloween party. Country singer Kelsey Ballerini dressed in skin-tight spandex as Olivia Newton John from "Grease." Supermodel Emily Ratajkowski’s Halloween costume was inspired by Jennifer Lopez’s famous Versace dress. Paris Hilton channeled Britney Spears’ "Baby One More Time" music video for her Halloween outfit. Mariah Carey dressed up as Morticia Addams.