Camila Cabello's "Havana" f/Young Thug (Syco/Epic) will hold down the #1 position at T40 for another week, and based on spin momentum it might just stay there until January! Halsey's "Bad At Love" (Astralwerks/Capitol) moves up to #3, while the Greatest Gainer is Ed Sheeran's "Perfect" (Atlantic), which notches up to #4. Joining the Top 10 is Dua Lipa's "New Rules" (Warner Bros.), and breaking through to the Top 20 is Taylor Swift's "End Game" f/Ed Sheeran and Future (Big Machine/Republic), Hailee Steinfeld & Alesso's "Let me Go" f/FGL (Republic) and Niall Horan's "Too Much To Ask" (Capitol). Joining the chart this week will be CNCO & Little Mix's "Reggaeton Lento" (Syco/Columbia).