We're not kidding. This report may be false, but according to Us Weekly, Chris Brown used that vile line on a girl he was attempting to pick up recently.

The alleged quote: ""Can I get your number? I promise I won't beat you!"

Brown's rep said: "I'd be surprised if Chris said something that stupid."

We would have to agree. If he did say that, it would defy comprehension ... even more than things Chris normally does like tell haters to f--k off on Twitter.

Brown, who pleaded guilty in 2009 to felony assault for hitting then-girlfriend Rihanna, reportedly used the line on an attractive brunette on February 10.

The setting was the Lasio Professional Hair Care suite Grammy gift lounge.

After he supposedly said it, a witness says, "He and his friends laughed about it, then one yelled, 'That's his new line!' Ugh! I wanted to throw up!"

It's unclear if the brunette accepted Chris' request.

We honestly don't believe this. Chris has big-time rage issues, and could do a lot better at taking responsibility, showing remorse and simply shutting up.

He seems to fly off the handle only when provoked, however, and such a brazen remark seems a tad uncharacteristic, even if Chris is far from perfect.

We can see him fuming at "haters," which is what seems to set him off every now and then, but not joking about beating girls to their faces.

Come on, Us. Chris has work to do, but spreading rumors like this is just as bad as his recent tirade. Legitimate criticism is one thing; slander another.