Kourtney Kardashian & Megan Fox Support Travis Barker & Machine Gun Kelly At Avril Lavigne Concert

The girls at the rock show! Kourtney Kardashian and Megan Fox supported their musician beaus at an Avril Lavigne concert. Travis Barker and Machine Gun Kelly joined the pop-punk princess onstage at Los Angeles’ The Roxy for SiriusXM and Pandora’s Small Stage Series on Friday. Kourtney was on the side stage watching her drummer fiancé, while Megan hung out in the audience to see MGK and Avril team up for their new song “Bois Lie,” Access Hollywood has learned.