Miller donned a mustard-colored dress with a revealing slit, which she paired with white block-heeled sandals — an on-trend choice, as both white shoes and block-heeled sandals have become nearly ubiquitous this summer — for a seasonably appropriate look.
In addition to Miller, pre-show entertainment included Echosmith, Hey Violet, new Hope Club, PRETTYMUCH, Sleeping with Sirens and STEP. Jake Paul, who hosted the show, performed with his band, Team 10, to help kick off the party.
Graham and Noah Sierota of Echosmith donned dark suits, while Sydney Sierota, the female member of the trio, opted for a shiny leopard printed dress, which she, like Miller, paired with white sandals.
Former One Directioner Tomlinson wore a track jacket with clean white sneakers for a casual look, comfortable for an onstage performance.
Two of the female performers opted for sleek, monochromatic looks: Rexha wore head-to-toe black, sporting a buttoned-up look.
Larsson went for a similar colorway but wore a black bra under a blazer for a sensual look, accessorizing with sparkling diamond earrings and skyscraper black and white heels that added a fun element to her look.
Zara Larsson wears a black suit with a bra and platform sandals at the Teen Choice Awards.Ora, like Miller in her yellow dress, opted for color: She donned a hot pink Alexandre Vauthier gown with a plunging neckline, paired with silver sandals.
To see more looks from the red carpet, click through the gallery.