The purported victim claims that Irvin bought her drinks July 4th weekend in 2007, and then lured her to his room in the Seminole Hard Rock Hotel and Casino in Florida.
Then, in the room, he and another man tried stuffing money into her clothes, according to the suit, and CBS affiliate WFOR in Miami.
The two then insisted on sexual favors, according the woman. When she said no, the other man allegedly held her down while Irvin raped her. The woman claims she was then forced to perform oral sex on the other man, according to the suit.
The woman said Irvin's brother, Derrick Irvin, then took her to another room and ``assisted in covering the sexual assault and rape up," according to WFOR.
The woman's attorney filed the lawsuit Thursday after settlement talks broke down.
No criminal charges have been filed against Irvin. The Broward County State Attorney's office is expected to decide on that next week.
Irvin's attorney Larry Friedman says the allegations are "totally false and totally unsubstantiated," and that the suit "is tantamount to 'civil extortion.'"
Three months ago the woman and her attorney came to Friedman, saying they wanted $1 million or they would file a lawsuit the week before the Super Bowl while Irvin was broadcasting from Florida, according to WFOR.
Friedman says they declined the settlement, and the woman's lawyer then asked for $800,000.
Irvin is in Miami for Super Bowl XLIV as a local radio host and as an analyst for the NFL Network.