Apparently, P. Diddy just isn't "cool" with Naomi Campbell and probably wishes he hadn't bumped into the short-tempered model over the weekend.

It's been said that the rapper "screamed" at Naomi Campbell during a heated bust-up at a Grammy's after-party.

Diddy and the supermodel both attended Jermaine Dupri's post-ceremony bash on Sunday night, and eyewitnesses claim the hip-hop star angrily confronted Naomi as soon as he laid eyes on her.

A source told the New York Daily News newspaper, "Diddy just started screaming at her when he saw her. No one could believe it. He was screaming obscenities at her, and also screaming at Terrence Howard, who was with her."

Naomi is said to have "played it totally cool" and brushed off the unpleasant incident.

Diddy and the catwalk beauty - who recently admitted assaulting her former assistant and confessed to having anger management problems - used to be friends. However, Diddy's long-term partner, Kim Porter - the mother of his new baby twin girls - allegedly doesn't like Naomi.

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