An “enraged” Sean “Diddy” Combs once repeatedly struck his longtime girlfriend Cassie Ventura “pretty hard” in front of her friends because she didn’t answer her phone, a celebrity stylist testified Wednesday.

Deonte Nash told jurors at Combs’ bombshell federal trial in Manhattan that he witnessed the disgraced music mogul fly into a violent rage in Ventura’s apartment as the stylist was helping her pack for a trip in 2013.

“Bitch, didn’t I tell you to answer the phone?” Nash recounted Combs saying.

He “grabbed her by the hair, pulled her off the couch and started hitting her,” the stylist said.

The alleged ordeal, which unfolded as Ventura was prepping to leave for Drake’s OVO festival in Toronto, took place in front of the stylist and a handful of others, Nash testified.

Elsewhere during his testimony, Nash — who was Ventura’s long-time stylist and considered them close friends — told jurors that Combs tried to control every aspect of his then-girlfriend’s life.

He once forced Ventura to come home from a 2013 night out at a Los Angeles gay club because he was angry she’d gone there with Nash, singer Rita Ora and Cheetah Girls singer Adrienne Bailon-Houghton.

The celebrity stylist told jurors they were at the club when Ventura took a call from Combs on speakerphone during which he allegedly told her that “she better bring her ass to his house.”

“She started to panic,” Nash told the jury.

“Then [Combs] called back and he talked to me and told me that we were wildin’ and that he thought he told us not to be going out since every time I go out that bitch wanna go.”

Nash testified that Ventura “just packed her stuff and went to his house.”

The stylist, who also worked for Combs from 2008 to 2018, said this was one of two times the disgraced music mogul had told him and Ventura that they needed permission from him before going out.

As Ventura’s stylist, Nash said he had to repeatedly seek approval from Combs for her outfits and appearance.

He alleged, too, that an irate Combs once put his hands on him before the 2014 Vanity Fair Oscars party after the rapper blew up because Ventura had opted to wear her hair down.

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“She looked bomb…Her hair was long,” Nash said, alleging that a fuming Combs told him: “I thought I told you to keep her hair up.”

He testified that Combs then “grabbed me by my jacket and lifted me up.”

Once Nash had pinned Ventura’s hair up, he said Combs declared: “I was right, it looks better that way.”

Meanwhile, Nash — who noted he spent almost every day with Ventura — alleged he also constantly overheard Combs berating and threatening his then-girlfriend.

Asked what threats he overheard, the stylist responded: “That he would beat her ass. That he wouldn’t put her music out. That he would get her parents fired from her jobs and that he would send her sex tapes to their jobs.”

“He told her that she was an outright h-e. He told her she was nothing but a s–t anyway,” Nash added.

The stylist testified, too, that the alleged abuse drove Ventura “crazy.”

“She would be super emotional, would cry, sometimes she would just stay in the house for days and go into a cocoon,” he said.

Combs, 55, has pleaded not guilty to charges including racketeering conspiracy and sex-trafficking. He could face life in prison, if convicted.