(left to right) Katy Perry, Kelsea Ballerini, Karrueche Tran, Maddie Ziegler and Shawn Mendes rocked the red carpet at the 2017 iHeartRadio Music Awards. Getty Images
The 2017 iHeartRadio Music Awards rocked The Forum on Sunday in Los Angeles.
The show, hosted by Ryan Seacrest, featured powerhouse performances by Katy Perry, Big Sean, Noah Cyrus and Labrinth, Ed Sheeran, the Chainsmokers and Chris Martin, Thomas Rhett, Shawn Mendes and Bruno Mars.
Justin Timberlake walked away with the Song Of The Year award for "Can't Stop the Feeling," Adele nabbed Album of the Year for "25" and Female Artist of the Year, and Justin Beiber was named Best Male Artist. Other big winners include Twenty One Pilots, Kelsea Ballerini, Green Day, Disturbed, Dierks Bentley, Thomas Rhett, the Chainsmokers, Drake, the Weeknd and Chance the Rapper.
The red carpet was just as electric. Check out the must-see looks of the night in the slideshow above.
Laura Marano had some fun in a long-sleeve, backless Marc Jacobs Spring 2017 minidress and studded booties.
Alberto E. Rodriguez/Getty ImagesCountry Artist of The Year Thomas Rhett rocked a black-and-white jacket with Daniel Patrick's low crotch ripped skinny jeans in black. Alberto E. Rodriguez/Getty ImagesDemi Lovato flaunted a futuristic Moschino look, including a silver belted minidress and matching jacket.Jesse Grant/Getty ImagesNoah Cyrus rocked a '90s-inspired Marc Jacobs Spring 2017 black sheer floral minidress featuring long puffy sleeves and key-hole detail paired with sky-high platforms.Alberto E. Rodriguez/Getty ImagesNever one to be conventional, Halsey wore an edgy yellow Versus Versace Spring 2017 outfit, which included a wool and nylon jacket, a belt crop top and matching leggings. She completed the look with Stuart Weitzman Nudist sandals. Jesse Grant/Getty ImagesChristina Milian flaunted her asset in a Rubin Singer metallic minidress, styled with pointed-toe pumps and the 21HM Mia Ring.Alberto E. Rodriguez/Getty ImagesJoe Jonas who was nominated with his band DNCE for Best Duo/Group of the Year and Best Cover Song rocked an Emporio Armani red-and-silver hooded bomber jacket with a pair of red trousers and Yeezy sneakers.Jesse Grant/Getty ImagesKarrueche Tran took on the pajama trend in a red Yousef Akbar Resort 2017 look, featuring a satin jacket, matching wide-leg pants and braletteJesse Grant/Getty ImagesMaddie Ziegler was totally adorable in a Giambalook, which included a ruffled top, leopard skirt, styled with Edie Parker Jean magnetic clutch and baby blue boots. Jeese Grant/Getty ImagesBefore opening the show, Katy Perry walked the red carpet in an August Getty strapless white, and gold wide-leg jumpsuit styled with Jimmy Choo pumps and Jacob & Co. jewels.Alberto E. Rodriguez/Getty ImagesBefore performing, Shawn Mendes walked the red carpet wearing an Emporio Armani black-and-silver brocade one-button shawl collar dinner jacket trimmed in black velvet with a classic black shirt and black trousers. Jonathan Leibson/Getty ImagesOlivia Holt shined in a peach Kaufmanfranco minidress and metallic strappy sandals.
Jesse Grant/Getty ImagesDarren Criss (left) wore a Emporio Armani green-and-silver patterned bomber jacket with a navy T-shirt and navy jeans. His brother Chuck Criss of "Computer Games" wore an Emporio Armani black, silver and red patterned bomber with a striped T-shirt and gray jeans.
Alberto E. Rodriguez/Getty ImagesBest dressed couple? Jhene Aiko (left) showed up in an orange DKNY long-sleeve off-the-shoulder dress, styled with a hot pink suede bag and Loriblu navy velvet ankle strap sandals. Her boyfriend, rapper Big Sean, coordinated in an orange Gosharubchinsky jacket, a Louis Vuitton Spring 2017 logo tee, Etro Fall 2016 velvet pants. Cartier jewelry and Daniel Patrick's black Chelsea boots. Jesse Grant/Getty ImagesBest New Country artist Kelsea Ballerini has disco fever in a Pamella Roland Pre-Fall 2017 long-sleeve navy-and-black sequin and beaded wide-leg jumpsuit paired with a Tyler Ellis Mini Perry Clutch in black.Jesse Grant/Getty Images"Project Runway" host Heidi Klum was ultra-chic in a black-and-white, one-shoulder Redemption minidress.Jonathan Leibson/Getty Images(left to right) Dinah Jane, Lauren Jauregui, Ally Brooke and Normani Kordei of Fifth Harmony all wore Philipp Plein looks.Jesse Grant/Getty Images
