Who Beat Up Justin Bieber?

Did someone bruise our “Baby” singer? Earlier today, Justin Bieber tweeted a picture of himself with a great big shiner on his right eye with the caption “#badass”. We have a funny feeling that badass is code for “special effects makeup”. Could this be from taken from the CSI set for JB’s follow up episode (airing February 17) or did Biebs get in another laser tag fight?