It's always exciting to see famous stars work together on music, but what's even better is getting to see them share performances on stage! Some of the most amazing pairs have toured together in the past few years, but have you ever wondered who stars like Ariana Grande and Justin Bieber toured with before they rose to fame? The answers might shock you!
Click through the gallery to see the most surprising pairs who went on tour together!
Shane Harper opened for Cody Simpson and Greyson Chance on their Waiting 4U Tour in 2011.