Austin Mahone, The Vamps, Fifth Harmony And Shawn Mendes Perform At The Hard Rock Joint [Getty Images]

LAS VEGAS, NV - JULY 31: Singer Camila Cabello of Fifth Harmony performs at The Joint inside the Hard Rock Hotel & Casino on July 31, 2014 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)

Getty Images Entertainment Ethan Miller