They're not the most likely of musical bedfellows, but it seems that shock-rocker Marilyn Manson and Justin Bieber have become firm friends.

The pair were pictured together in LA on Friday night, both posting images to their Instagram pages, with Bieber captioning his (below): 'Night out in LA with the boys'.

In recent weeks, Bieber has been spotted wearing a Marilyn Manson t-shirt, and the rocker responded by wearing a Bieber t-shirt (below).

Are we witnessing the beginning of a beautiful friendship? Perhaps even... a collaboration?