5 Seconds of Summer's "Youngblood" (Capitol) will remain in the #1 spot for another week. Bebe Rexha's "I'm A Mess" (Warner Bros.) officially joins the Top 10. Shawn Mendes' "Lost In Japan" f/Zedd (Island/Republic) breaks into the Top 25. Moving up inside the Top 30 this week will be Anne-Marie's "2002" (Warner Bros.) and LSD's (Labrinth/Sia/Diplo) "Thunderclouds" (RECORDS/Columbia). And look for David Guetta's "Don't Leave Me Alone" (WhatA/BigBeat/Atlantic) and The Chainsmokers' "This Feeling" f/K Ballerini (Disruptor/Columbia) to join the chart this week.