Taylor Swift joked that she may have finally broken her flower-painted piano during the acoustic section ... As she noodled some chords at the end of the Eras Tour catwalk, she said, "It's also ...

"This is why [Taylor] is such a genius, man," he says before breaking down the chords used in ... Puth's song "Tears On My Piano" is even a reference to one of Swift's first big hits.