British model Kelly Brook -- who was eaten by killer fish in "Piranha 3D" -- dared to go back in the water in South Beach this week ... along with her wrecking machine of a boyfriend.
The jacked dude on Kelly's arm is David McIntosh -- a model/actor ... who formerly served in the British military as a Royal Marines Commando.
In fact, David says before he got into professional posing ... he served in Iraq, Afghanistan, Somalia and Northern Ireland.
Impressive body of work.
'Piranha 3D' Star
My BF Could Beat Up Your BF
2/4/2014 7:07 AM PST BY TMZ STAFF
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