"Another celebrity stood by and watched as Combs and Carter took turns assaulting the minor," the lawsuit said without naming the celebrity.
Jay-Z was added to the lawsuit that was originally filed in October as one of several anonymous complaints by Texas attorney Tony Buzbee.
Many of the lawsuits did not survive because the plaintiffs declined to be named but, in this case, the judge said the then 13-year-old showed sufficient cause to continue anonymously.
Carter was identified in the original complaint as Celebrity A.
The plaintiff alleged she was noticed by a limousine driver who invited her to the afterparty where Combs and Carter raped her.
In a statement posted to the Roc Nation X account on Sunday, Jay-Z denied the allegations made against him in the filing.
Carter released a statement through Roc Nation saying,
Jay-Z was added to the lawsuit that was originally filed in October as one of several anonymous complaints by Texas attorney Tony Buzbee.
In a statement to ABC News Buzbee said, "The pleading speaks for itself. This is a very serious matter that will be litigated in court."
Buzbee also took to his personal Instagram account on Sunday, saying he would not be "bullied or intimidated," without mentioning the specific lawsuit, Jay-Z or Diddy by name.
"People will see through this effort to discredit me and my clients and the truth will be revealed," Buzbee wrote. "I also won't allow anyone to scare my clients into silence. Sunlight is the best disinfectant and I am quite certain the sun is coming," he added.
Many of the lawsuits did not survive because the plaintiffs declined to be named; however, in this case, the judge said the then-13-year-old showed sufficient cause to continue anonymously.
Combs' legal representatives responded to the filing in a statement to ABC News on Sunday, saying, "This amended complaint and the recent extortion lawsuit against Mr. Buzbee exposes his barrage of lawsuits against Mr. Combs for what they are: shameless publicity stunts, designed to extract payments from celebrities who fear having lies spread about them, just as lies have been spread about Mr. Combs."
"As his legal team has said before, Mr. Combs has full confidence in the facts and the integrity of the judicial process. In court, the truth will prevail: that Mr. Combs never sexually assaulted or trafficked anyone -- man or woman, adult or minor," Combs' representatives said in the statement.
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