TMZ reported yesterday Charlie Sheen was getting it IN over the weekend, holed up with 3 porn stars, drinking and partying out in Las Vegas. As of right now, he’s missing in action and should have been on the set of his show “2 and a Half Men” over 2 hours ago!

Charlie’s people, as well as suits from the studio … are deeply concerned for him. Charlie’s people have been trying to get him in rehab but he doesn’t think he has a problem.

Charlie hasn’t communicated with the people from “Two and a Half Men” yesterday or today.

Hit the jump for pics of Bree Olson…one of the porn stars he’s with!