charlie sheenIt's no secret that Charlie Sheen has struggled with addiction and self-destructive behaviors in the past. The 'Two and a Half Men' star's troubles have even been written into the womanizing, booze-loving character he plays on the hit sitcom. But according to RadarOnline.com, Sheen has once again strayed from sobriety and is back "partying hard" with a "revolving door" of porn stars.

The popular actor is no stranger to relationships with adult film stars. In October 2010, he was hospitalized after a wild bender at The Plaza and accused pornographic actress Capri Anderson of stealing his wallet.

While the cops might not have been summoned this time in Vegas, these reports indicate Sheen has yet to kick the partying, playboy habits for which he sought the help of a sober coach.