The fan-fueled fourth annual iHeartRadio Music Awards on Sunday, March 5, will feature live performances and first-time duets and collaborations by today's biggest artists, including Katy Perry, Ed Sheeran, The Chainsmokers, Shawn Mendes, Thomas Rhett, Noah Cyrus and Big Sean, who join previously announced performer Bruno Mars.

Hosted by Ryan Seacrest, host of On Air with Ryan Seacrest, his market-topping #1 nationally syndicated LA morning drive-time show for iHeartMedia's 102.7 KIIS-FM, as well as a nationally syndicated Top 40 radio show, the event will air live on CTV2 at 8 p.m. ET from the historic Forum in Los Angeles.

"The biggest artists in music show up each year," said Seacrest. "iHeartRadio reaches hundreds of millions of people across the country every day, so this is an opportunity for the fans to have a voice in who's the best and brightest, and the artists, in turn to show their appreciation. It's always a lively celebration and an evening of special performances and appearances."

Nominees for the iHeartRadio Music Awards were announced on January 4. Drake leads nominees with 12 nominations, including Male Artist of the Year, while The Chainsmokers received 11 nominations, including the inaugural Best New Pop Artist category. Other artists who have received multiple nominations include Rihanna, twenty one pilots, Justin Bieber, Ariana Grande, Beyoncé, Daya, Halsey, Nicky Jam and Sia.

This year, the iHeartRadio Music Awards will feature new awards for Producer of the Year, Label of the Year and Best Music Video, as well as individual awards in music's biggest genres for Artist of the Year, Song of the Year, Album of the Year and Best New Artist presented by the all-new 2017 Subaru Impreza®.