This weekend on The iHeartRadio Countdown with Mario Lopez we've got a guest host taking over the mic! Legendary DJ and music producer Steve Aoki is taking over the show! Steve Aoki works with everyone in the industry and we be appearing at the 2019 iHeartRadio Music Festival in a couple weeks as well! Plus he just dropped a brand new song with the Backstreet Boys called 'Let it Be Me' yesterday! So Steve will break down all that, countdown the top 20 songs in the country, play some of his favorite songs and play some Aoki classics as well! Tune in!