A woman who claims Russell Brand sexually assaulted her took the stand on Tuesday in his rape trial … describing the alleged incident as “frenzied” and even “violent” … and she claims his entourage stood by and watched.

The woman testified in court that she was working at a radio station in London in the mid-2000s when he grabbed her suddenly and allegedly began kissing her.

Brand allegedly grabbed the woman’s buttocks and breasts and pushed her against a wall … and she says 4 members of his entourage — 3 men and 1 woman — watched the “violent,” “sloppy” and “frenzied” alleged attack.

The woman says she eventually pushed him away and told him to “f*** off” … after which she says Brand backed off and began laughing.

The incident was no laughing matter to the woman, though … who went outside to smoke a cigarette, feeling “dirty, shocked, stunned and shaken.”

The alleged victim did not go to the cops at the time … but reported the incident in 2023. When asked if she is sure Brand is the one who assaulted her, the woman replied, “The person who assaulted me was Russell Brand. I can’t forget that.”

As for why she didn’t tell her employer, Capital Radio, the woman says the company culture was misogynistic … and she felt her colleagues would just tell her she was “lucky.” She also said she feared losing her job and had a mortgage to pay.

As we’ve reported … other women have also detailed their own alleged experiences with Brand in court — with one claiming he raped her in her hotel room and another alleging he tried to pull her into a bathroom while working for MTV.

Brand has repeatedly denied all wrongdoing … insisting he has never had nonconsensual sex with anyone.