Mel Gibson's Alleged Mistress -- Fit for Fame

8/5/2010 5:35 PM PDT BY Johnny Lopez
Mel Gibson's alleged mistress Violet Kowal was somehow photographed working out in L.A.'s Runyon Canyon on Thursday.

media_removed_tmz_toofab

FYI -- Mel has denied having an affair with Violet ... who also happens to be a Polish fitness model.