Question: who won best boy band i heart radio
Answer: ak Yellow '' -- Cardi B `` Despacito '' -- Luis Fonsi and Daddy Yankee `` There 's Nothing Holdin ' Me Back '' -- Shawn Mendes `` Look What You Made Me Do '' -- Taylor Swift `` Perfect '' -- Ed Sheeran Best Cover Song Best Fan Army `` The Chain '' -- Harry Styles `` All We Got '' -- Shawn Mendes `` Bad Liar '' -- HAIM `` Issues '' -- Niall Horan `` Lost '' -- Khalid `` Say You Wo n't Let Go '' -- Camila Cabello and Machine Gun Kelly `` Touch '' -- Ed Sheeran `` The Tribute Song '' -- Thirty Seconds To Mars BTS A.