He said Brown pushed Rihanna's head against the window, punched her with his right hand, and then continued driving while hitting her, the affidavit states.
He also bit his girlfriend on the ear, the affidavit states.
Brown was arrested February 8 -- the day of the Grammy Awards, where he was scheduled to perform -- and booked on suspicion of making criminal threats, the spokeswoman said.
Brown, who did not appear at the awards show, was released from jail that night on ,000 bail and given a March 5 court date.
"I am seeking the counseling of my pastor, my mother and other loved ones and I am committed, with God's help, to emerging a better person." He added, "Much of what has been speculated or reported on blogs and/or reported in the media is wrong.
While I would like to be able to talk about this more, until the legal issues are resolved, this is all I can say except that I have not written any messages or made any posts to Facebook, on blogs or any place else.
PHOTOS: Most revealing Grammys dresses of all time Another source told Us that Taylor Swift, 23, couldn't be seated near either fellow country crooner Carrie Underwood, 28, or her ex Mayer.
"Words cannot begin to express how sorry and saddened I am over what transpired," the 19-year-old said in a statement released by his spokesman.
Brown allegedly threatened to kill Rihanna after she pretended to leave a phone message with her assistant, telling her to have the police waiting at her house.PHOTOS: Rihanna and Chris throughout the years Rihanna, 24, and Brown continued their love-fest after the ceremony as well, sipping on cocktails and "getting very affectionate" whispering in each other's ears throughout the night at the Zing Vodka Post Grammy Party held at Hollywood's Supperclub, an observer told Us.The rift between Perry and Rihanna wasn't the only seating nightmare of the night, however. The 19-year-old R&B singer remains free on ,000 bail.The felony complaint handed down in court Thursday morning identifies Brown's alleged victim only as "Robyn F." Rihanna's real name is Robyn Rihanna Fenty.Brown's lawyer did not respond to repeated requests for comment.Police said Brown and a woman were in a vehicle near Hollywood's Hancock Park early February 8 when they became involved in an argument.Police said at the time a woman identified Brown as her attacker during an early morning dispute in an upscale Los Angeles neighborhood.A phone message left for Brown's attorney, Mark Geragos, was not immediately returned Thursday.Katy Perry, who got close with the "Stay" singer at last year's Grammys, "doesn't approve" of Rihanna's decision to get back together with Brown, 23, and their friendship has suffered as a result of it, sources tell Us Weekly.PHOTOS: All the best moments from Grammys 2013 "They aren't tight anymore because Katy doesn't approve of Rihanna dating Chris Brown," an insider told Us of the pair.