Kelly Osbourne claims a hacker broke into her personal email account and may have stolen private information -- but the "ass" behind the cyber-crime may have made a crucial mistake ... and now cops are hot on his trail.
Just a few hours ago, Kelly went to her Twitter account and revealed, "Someone has hacked my mail account the police are now involved who ever did this is in big HUGE trouble!!"
But Kelly also points out the perp's mistake -- saying, "The ass that hacked my account had all my emails forwarded to his email
address so I now know who it is I will find u & u will be arrested."
Kelly says she's "Genuinely heart broken" ... but she still issued one final threat to the hacker -- "if you try and sell any of my information you will be prosecuted even further."