LAS VEGAS, NV - MAY 21: Recording artist Camila Cabello poses in the press room during the 2017 Billboard Music Awards at T-Mobile Arena on May 21, 2017 in Las Vegas, Nevada. (Photo by David Becker/Getty Images)

Camila Cabello, who just dropped her first album last Friday. Took her first big single “Havana” to the classroom with Jimmy Fallon.