Jackass star Steve-O celebrated 13 years of sobriety yesterday (Wednesday 10 March) and marked the occasion by showing how far he's come, with a shout-out to his friend and co-star Johnny Knoxville.

Posting on Facebook, the 46-year-old shared two pictures of himself - one of him looking somewhat worse for wear in 2006, surrounded by what appears to be nitrous oxide cannisters, and another of him recreating the pose in the present day.