Before presenting one of the biggest awards of the evening, the talk-show host and author works a black jumpsuit.
Before accepting the iHeartRadio International Artist of the Year award, the "Close" singer shows off his signature style.
Camila Cabello, Normani Hamilton, Dinah-Jane Hansen, Lauren Jauregui and Ally Brooke are ready to work, work, work down the carpet.
Slay Shay, slay!
Radiant in red! The evening's host steps out in a hot number.
The supermodel works a fully beaded and embroidered gold cocktail dress from KAYAT.
Perhaps it's the makeup by Kelsey Deenihan? Maybe the glitzy dress? Whatever the reason, this Pretty Little Liars star looks beautiful.
The "Love Myself" singer poses on the carpet before dedicating her performance to dad.
Dressing casual has never looked so good on the carpet.
Jamie Schneider Mizrahi deserves the credit for styling this Pretty Little Liars star's ensemble.
We are "Here" for the singer's casual yet stylish look.
Hunk alert! The Criminal Minds star is looking and feeling good on the red carpet.
The Supergirl star is pretty in pink!
The "Sound of Your Heart" singer cleans up nicely before his performance.
The vlogger and YouTube star is ready to dance the night away.
The "Hold Back the River" singer prepares to celebrate the biggest music hits of the year.
The "Life of the Party" singer is ready to rock in Toronto.
NEXT GALLERY: Best of the Red Carpet