30-year-old Niall Horan and 25-year-old Shawn Mendes performed a duet of "Treat You Better" at Horan's London concert.

30-year-old Niall Horan and 25-year-old Shawn Mendes surprised fans with an acoustic duet of "Treat You Better" at Horan's London concert. Mendes also attended Paris Fashion Week, appearing at Loewe's runway show and sharing photos on Instagram. Fans have been asking about new music from Mendes, following Camila Cabello's recent album release hinting at their previous relationship.