Monochromatic and two-toned fashion ruled the red carpet at last night’s KIIS-FM iHeartRadio Jingle Ball in Los Angeles.
First case in point: Katy Perry. The pop star managed to stand out from the welcome mat at The Forum despite her matching all-red ensemble — complete with a bustier-top tulle dress featuring a cinched waist and inch-thick straps, pointed-toe pumps in satin and a laminated beret.
![Katy Perry KIIS-FM iHeartRadio Jingle Ball, Arrivals, The Forum, Los Angeles, USA - 06 Dec 2019](https://footwearnews.com/wp-content/uploads/2019/12/shutterstock_editorial_10493875ah.jpg)
BTS, on the other hand, took the latter tack: The seven-member South Korean boy band opted for unifying black-and-white outfits styled in different ways — think a variety of black and white jackets with contrasting lapels, ties and bowties, shirts, pants and shoes. (The group later hit the stage in the same gear with a surprise appearance from Halsey.)
![BTS KIIS-FM iHeartRadio Jingle Ball, Arrivals, The Forum, Los Angeles, USA - 06 Dec 2019](https://footwearnews.com/wp-content/uploads/2019/12/shutterstock_editorial_10493804d.jpg)
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Billie Eilish also took on black and green bicolors from head to toe. Her roots made way for neon green highlights leading down to fluorescent-rimmed shades. She slipped into a black jacket with bright green lettering and, in contrast, green sweatpants with black text. Even more notable were the artist’s green socks paired with similarly hued Balenciaga Triple S clear-sole sneakers. (The highly coveted shoes retail for $995.)
![Billie Eilish KIIS-FM iHeartRadio Jingle Ball, Arrivals, The Forum, Los Angeles, USA - 06 Dec 2019](https://footwearnews.com/wp-content/uploads/2019/12/shutterstock_editorial_10493875h.jpg)
The festive annual concert series also welcomed A-listers including Lizzo, Sam Smith, Camila Cabello and Normani.
Click through the gallery to see more celebrities on the red carpet at the KIIS-FM iHeartRadio Jingle Ball.
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