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Chris Brown had a meltdown Sunday after Tyson Beckford dared to post a pic of himself with Karrueche Tran, but Tyson made it clear, he's not scared one bit.

According to TMZ, it started Sunday when Chris saw the pic, then posted a flurry of tweets, saying among other things, "U wanna keep walking them runways. I need ta legs for that. Keep playing like I ain't wit the bulls***."

Chris deleted the tweets, but Tyson fired back, seemingly impervious to the threats, saying, "It's all about fun in Vegas, come thru papa."

Tyson then posted video of himself shooting a gun range, saying, "Just in case your forgot!"

But Chris wasn't done. Late Sunday night, Chris posted a pic of Vegas cops behind a building, saying, "This n**** Tyson got the whole Vegas PD out here. Suckah! This fruitz!"

Chris has been making a play to get Karrueche ever since she found out he had a child by another woman.

Don't know whether this helps or hurts Chris' chances.