Jean-Claude Van Damme: 'Welcome to the Jungle' in Puerto Rico!

Jean-Claude Van Damme shows off his biceps in a black tank on the set of Welcome to the Jungle on Tuesday (February 14) in Puerto Rico.

The 51-year-old action star looked almost unrecognizable donning a large mustache and sideburns.

Welcome to the Jungle centers around a company retreat on a tropical island that goes terribly awry.

The thriller, set to be released sometime in 2013, co-stars Adam Brody and Dennis Haysbert.

Later this year, Jean-Claude can be seen in The Expendables 2 opposite Sylvester Stallone, Jason Statham, Bruce Willis, Arnold Schwarzenegger, and Liam Hemsworth.