Kevin Federline That Penis Pic Is Bogus My Real Dong's Hella Bigger!

11/26/2014 1:00 AM PST
EXCLUSIVE

Kevin Federline
 is calling BS on the naked pic supposedly featuring his legendary baby maker -- telling people the shot is faker than his rap career. 

The shot's been all over the Internet ... apparently showing K-Fed gripping his Sexcalibur like he's preparing for battle. 

But sources close to Federleezy say he's 100% certain it's a Photoshopped pic ... not only because he has tattoos down by the dragon's den which aren't in the pic -- but he also claims his shlong is way shlonger in real life. 

K-Fed's penis couldn't be reached for comment.