Chris Brown -- SHOVES Woman ... Blocks Her Attempted Kiss

Chris Brown got physical with a woman who jumped in front of him during a nightclub appearance in Houston -- and even though she initiated the contact ... it was a questionable reaction from Chris.

Chris performed at Limelight Houston over the weekend, and while he and Karreuche Tran were walking through the crowd ... a woman stepped in front of him and reached out ... apparently trying to kiss him. CB gave her a pretty hard shove with his right forearm to move her out of the way.

It doesn't look like the fan was hurt. Obviously, not a smart move for someone with Chris' track record to mix it up with fans -- especially women -- even when they start it.

Suggestion, Chris: let security handle it.