We can always count on Halsey to steam up our screens with her sexy snaps, and the same can be said about the majority of her Halloween costumes. The 25-year-old singer has dressed up as Poison Ivy, Harley Quinn, and Princess Leia over the years, and this year, she's already channeled Marilyn Manson and Cher. Take a look at Halsey's Halloween costumes from years past ahead.