The world's biggest stars including the likes of Ed Sheeran, Alessia Cara, Katy Perry and Tove Lo guest host the iHeartRadio Countdown with Kian every week, counting down the weeks 20 hottest thumbed up songs as voted by YOU on iHeartRadio!

Tune in to the iHeartRadio Countdown Sundays 4pm – 6pm on KIIS1065 SydneyKIIS101.1 Melbourne97.3FM BrisbaneMixx 101.3 (Horsham), Mixx 88.9 (Hamilton & Portland), Mixx 106.3 (Colac), Mixx 107.7 (Swan Hill), TR FM 99.9 and 99.5 (Gippsland), 95.3 Coast FM (Warrnambool), Edge 102.5 (Deniliquin), Edge 102.1 (Wangaratta) ROK FM (Parkes), Max FM (Taree), Now FM (Moree), 4AK (Toowoomba), Eagle FM (Goulburn), Snow FM (Jindabyne), or 24/7 on iHeartRadio.

Missed an interview? Tune into the iHeartRadio Countdown podcast 24/7!