It takes a truly over-the-top look for a celebrity Halloween costume photo shoot to stop me mid-scroll on Instagram. But ...

Triple-threat entertainer Idina Menzel, who's best known as the voice of Elsa in the Frozen film franchise, turned heads this week in a stunning oxblood red dress by New York fashion label Simkhai.

Elsa Hosk/Instagram; Tim Graham Photo Library via Getty Elsa ... the 35-year-old supermodel revealed her costume on Instagram as a tribute to the late Princess of Wales' "revenge dress." "Wishing you ...