Rumored Kim Kardashian / Reggie Bush Mistress -- I'm No Dirty Check Forger!!!

The woman who allegedly broke up Kim Kardashian and Reggie Bush is a lot of things ... but a check-forging con artist isn't one of them ... at least that's what she told the judge.

TMZ broke the story ... January Gessert -- who rose to fame in 2010 by allegedly banging Reggie while he was still dating Kim -- was arrested in March after allegedly trying to cash bogus checks.

January was subsequently charged with three felonies relating to check forgery -- but she has since pled not guilty to all of them.