Chris Brown -- I'm On the Attack Now ... I'm Suing My Accuser

Chris Brown has a warning to anyone who makes false allegations against him ... no more Mr. Nice Guy. He'll be suing you.

Sources close to Chris tell us, he will be filing a lawsuit against Liziane Gutierrez, the woman who claims he punched her in the eye at a Vegas hotel. She filed a police report and made statements to others about the alleged incident. We're told Chris will be filing a defamation suit against her, as early as tomorrow.

Brown, we're told, is taking other steps ... for starters he's cutting out the "hangers-on" who are inviting "random girls" to hang out with him. He says this is the second time he's been falsely accused of abuse by party girls and he's putting a quick end to it.

As we reported Gutierrez also went after Jason Derulo after he left her on the sidewalk outside a Hollywood club and invited her friends to an afterparty at his home. She told TMZ a week after the party that Jason tried doing untoward things with the girls, who left the party crying.

Gutierrez refused to substantiate her accusation with a single example. Chris says it's proof she's just a bitter woman who lies when she doesn't get her way.