Mark Wahlberg shows off his big muscles in a tight gray t-shirt while walking around the set of his new film ‘Transformers 4’ in Chicago.

He’s 42.

http://malecelebnews.com/wp-content/images/2013/08/Mark-Wahlberg-Sighting-on-Set-of-Transformers-4-in-Chicago-02.jpghttp://malecelebnews.com/wp-content/images/2013/08/Mark-Wahlberg-Sighting-on-Set-of-Transformers-4-in-Chicago-02-87x150.jpgmcn* Actors* SightingsMark Wahlberg
Mark Wahlberg shows off his big muscles in a tight gray t-shirt while walking around the set of his new film 'Transformers 4' in Chicago. He's 42.