Camila Cabello surprises Jimmy Fallon with song she wrote for him

Camila Cabello surprised audiences on The Tonight Show Starring Jimmy Fallon by a song she just wrote. 

Cabello, set to release her new album C,XOXO on June 28, revealed she wrote a song on her way for Fallon with the lyrics including lines like, "New suit, same chair, new dress blonde hair/we've seen eachother through some phases."