Celebrity tattles claim that an angry confrontation took place at Jermaine Dupri’s Los Angeles Grammy Afterparty between Diddy and supermodel Naomi Campbell immediately following Clive Davis’ annual Grammy Afterparty.

“[Diddy] just started screaming at her when he saw her,” says the snitching source. “No one could believe it. He was screaming obscenities at her, and also screaming at Terrence Howard, who was with her.”

“Naomi played it totally cool,” the source goes on.

Other sources dish that while D&N used to enjoy a flirtatious friendship, their relationship soured under the influence of Kim Porter:

Kim Porter hates her,” the source continues. “There was also an issue that Diddy had wanted her to be the face of Sean John’s women’s line - but didn’t want to pay her.”

Other partygoers believe Naomi’s legendary disloyality to her friends may just be the real culprit:

“[Naomi's] circle of friends have been trying to help her get her life straight. But they feel all they’ve done has been in vain and she’s constantly causing trouble. She’s been a disloyal friend.”