That is a TINY waist!  Megan Fox somehow manages to laugh (which means she can breathe) in a very tight corset on the set of her new movie Jonah Hex.

Megan appears to play some kind of saloon wench in the horror Western that is currently filming in Louisiana.  Co-starring Josh Brolin, Jonah Hex tells the story of a scarred bounty hunter in the Wild West who tracks a voodoo practitioner bent on liberating the South by raising an army of the undead.  That’s a pretty interesting premise for a film, hopefully for Megan’s sake they keep her time in her corset costume to a minimum!