Mel Gibson's messy public split from the mother of his 8-month-old daughter got uglier on Thursday, when reports emerged about a 30-minute tape-recorded rant of the actor hurling racist and sexist epithets against Oksana Grigorieva.

Amid reports that physical abuse allegedly took place in the brief relationship Gibson, 54, had with the 40-year-old Russian model/singer following his divorce from his wife of 30 years, RadarOnline revealed that the actor used the N-word and other expletives during a profanity-laced argument with his ex.

Gibson's spokesperson did not deny that the speaker in the taped outburst was his client, but the onetime box-office giant has not commented on the recording as of press time. The couple, who were first seen together a month after [article id="1609146"]Gibson's divorce[/article] last year from the mother of his seven children, broke up in April and are fighting for custody of their daughter. Grigorieva reportedly made the tape because she feared for her life after Gibson allegedly made threats against her.

During one segment, Gibson allegedly says, "I am going to come and burn the f---ing house down ... but you will b--- me first." And in another, he reportedly tells her that she looks like a "f---ing pig in heat" who risked getting "raped by a pack of n-----s," as their baby screams in the background.

The Reverend Jesse Jackson told Radar that the latest racist outburst proved that Gibson has a "fundamental character flaw."

"Mel Gibson's outburst demonstrates once again that we are far from a society that is 'beyond race and racism,' " Jackson told the site. "His penchants for anti-Semitic and racist diatribes reveal the actor's fundamental character flaw. ... He needs help."

The Los Angeles NAACP released a statement to TMZ condemning the outburst.

"An apology is insufficient given his history of racism, sexism and anti-Semitism," L.A. branch president Leon Jenkins said. "No amount of words will change his image as an out of date and out of control racist. Only [with] a sustained period of positive acts can his legacy be redeemed."

Renowned attorney Gloria Allred also got into the mix and sent Gibson an open letter via Radar saying, "As an attorney who has represented many sexual assault victims and as a woman who is a survivor of rape myself, I want you to know how deeply offensive, appalling and harmful your reported statements are."

This is not the first time Gibson has been called out in public for using racial slurs. The "Lethal Weapon" actor, once one of the most popular, bankable movie stars in the world, was blasted by the Gay & Lesbian Alliance Against Defamation in 1991 over an interview in which he made derogatory comments about homosexuals. Several of his movies -- including "Braveheart" and "The Passion of the Christ" -- have been criticized for their portrayal of homosexuals and Jews.

In addition to allegations that "Christ" had anti-Semitic overtones, a leaked report from a DUI arrest in July 2006 had Gibson -- who has struggled with alcohol abuse -- making anti-Jewish remarks to one of the arresting officers, saying, "F---ing Jews. ... Jews are responsible for all the wars in the world." He also made derogatory, sexist remarks to a female officer during the same traffic stop, calling her "sugar t--s."

Gibson later confirmed that he made the comments and apologized twice through his publicist, but the incident appeared to have a lasting impact on his movie career, which has stalled since the arrest.

Gibson has denied claims by Grigorieva that he knocked her teeth out during an argument. Both parties have filed restraining orders against each other in the midst of the custody battle.

A spokesperson for Gibson could not be reached for comment at press time.