Travis Barker and Machine Gun Kelly took the stage with Avril Lavigne, and things got bubbly!Barker, Kelly and Lavigne hit up the famed Roxy Theater in West Hollywood on Friday night for SiriusXM and Pandora's Small Stage concert series. Once onstage, Kelly and Lavigne proceeded to pop a bottle of champagne. After all, there was plenty of reason to celebrate, as the event coincided with the release of Lavigne's first album in three years, .Kelly and Barker performed alongside Lavigne for their «Bois Lie» track.