Twitter: @machinegunkelly, @camilacabello97 I was in Cleveland the other day for Machine Gun Kelly's 2nd sell-out show in 2 days at the House of Blues. There was supposed to be a third night as well, but it got re-scheduled so that MGK could make it out to New York and film his performance on The Tonight Show Starring Jimmy Fallon. He said that night that this is his biggest song of his career, and there's high hopes of it going #1. Watch him kill the stage alongside Camila Cabello, a member of Fifth Harmony. The pair will be performing "Bad Things" on December 1st on yet another late night show: this one will be on James Corden.