AceShowbiz - Retro, edgy and quirky were all there on the red carpet for the 2019 iHeartRadio Music Awards. Among those who turned heads with unusual choice of outfits at the Thursday, March 14 award-giving event were Billie Eilish, That Poppy, Jackie Cruz and Katy Perry.

Billie looked extremely quirky in an oversized black shirt which had a print of Japanese anime character Sailor Moon. The "Lovely" singer paired the top with matching shorts while completing her style with black shoes and a slew of grunge jewelry.

As for That Poppy, the singer went bold in a bright yellow tulle featuring the words "Go To Hell" underneath a skull on fire. Adding her own accents to the Viktor & Rolf ensemble, the "I'm Poppy" songstress donned a heavily-spiked white collar featuring a large silver ring hanging from the front. She further made her whole style wild with black and white stripes on the platform.

Marshmello arrived in his iconic look. The producer looked dapper in a black-and-white jacket which went well with his custom helmet for public appearances. At the event, the "Happier" hitmaker nabbed two awards, New Pop Artist and Dance Artist, after being nominated for 6 categories.

Jackie Cruz opted for edgy yet comfortable fashion for the big night as she slipped into a black jumpsuit which featured cutouts at the waist part. As for Tiffany (II), the former Girls' Generation member looked stunning in a white mini dress with black trim at the collar and hem. Despite the edgy fashion, the 29-year-old star, who won Best Solo Breakout, looked angelic as she added a sheer cape with black trim and sheer thigh-high boots with black heels.

Without further ado, here are some celebrities who showed off their inner edgy and quirky side at the music event.