Sundance

Gabrielle Union is a baaad woman -- she just fired back at Stacey Dash and took down Ronda Rousey as collateral damage in her feud with Dash.

We got Gabby at LAX Tuesday ... on her way back from the Sundance Film Festival, where she dissed Stacey for suggesting the BET Awards should be canceled to make the Oscars more diverse. Gabby's reaction was the classic ... "Stacey Dash who?"

Watch the clip ... Ronda got dragged into this when photogs hinted Union and Dash's beef might get physical. Gabrielle also celebrated another victory ... her movie, "The Birth of a Nation" and a record-setting day at Sundance.

All she does is win.

Selena Gomez ignored the advice of medical professionals and waltzed out of rehab just 14 days into a 6-week program ... over the strenuous objections of the rehab staff ... TMZ has learned.

Sources close to Selena tell us just after New Year's she checked into a program at The Meadows called DAWN -- for alcohol, pot and Rx Ambien -- in addition to what her people believe is an unhealthy union with Justin Bieber.

But 2 weeks in, Selena bailed so she could go the Sundance Film Festival for her upcoming movie. She told her people she would return to the rehab facility after Sundance, but when it was over Selena decided she was cured and there was no reason to return.

Problem is ... that's not the way the medical staff at The Meadows sees it ... the treatment program is 45-days and Selena bailed four weeks early. We're told the staff feels it's essential in any recovery to complete the therapy.

Selena is telling her people ... she completed the toughest week, which the facility calls "Survivor's week" so everything is fine. Thing is ... Selena's not the doctor -- she's the one with the problem.

Mess Hilton was at Sundance on Sunday, torturing attendees with her vocal stylings at a private party. First the world had to endure her album, now she's back to throw salt on the wounds!

We just got word that a major power outage in the city has turned the lights out on Main Street. Spies inside several parties including the Hard Rock Hotel Flaunt Magazine party tell us stars like Brittany Murphy, Paris Hilton and Mos Def are standing around in total darkness while the city figures out how to get the lights back on.

The aging child stars have been spotted around Park City with dueling camera crews following their every move. Coleman's rep tells TMZ he's in town to shoot a short film (get it? short film), though he wouldn't say any more about it. Diamond says he came to Sundance to "outgift" Coleman.

"My crew is going to be filming me come along and outdoing Gary Coleman," Screech told the Website iklipz.com, adding, "bigger and better and more expensive swag in every way, shape and form."

To do so, Diamond isn't above a little begging. He was at the Karl Feinstein Style Lounge when he got a crystal quartz charm bracelet from designer Kathleen Cavalaro. Then he tried to charm more out of Kathleen, but she wasn't having it. Sex tape stars don't get special treatment from her!

If Tara Reid wants to shake her party girl image, she should probably reconsider performing simulated sex with rappers onstage.

TMZ obtained exclusive footage from Sundance of Tara, moments after she climbed onstage at the Blender Sessions party at Tao nightclub, while Akon performed his hit song, "Smack That." And for this performance, the "that" was Tara Reid.Tara mounted then gyrated on Akon as he pretended to pump her all around the stage. One of his mohawked band members decided to get in on the action, and the two bounced Tara around between them.

The Sci-Fi Channel, in conjunction with the Sundance Channel, is launching an eight-week long short film competition to find the world's next great science fiction auteur.

The competition, aptly titled "Exposure," will search for the best 2-8 minute sci-fi, horror or fantasy short. Films will be judged by a committee of Sci-Fi Channel and Sundance Channel experts, who will post the best flicks on the Internet each week. Fans will then vote for eight weekly champions to compete in an on-air special on the Sci Fi Channel. Viewers will vote online to determine the grand prize winner.

Submissions are welcomed from now until November 20th. Online voting will begin October 23rd.

The upcoming "Black Snake Moan" starring Samuel L. Jackson, Justin Timberlake and Christina Ricci has taken an unsual approach in promoting the film.

Paramount Vantage has created a contest that challenges fans to download artwork and audio from the film and create a trailer for the new movie. The winner gets a trip to the Sundance Film festival.

Set in Tennessee, the southern gothic film chronicles a tale of rage and love when ex-blues guitarist Lazarus (Samuel L. Jackson) discovers Rae (Christina Ricci) beaten nearly to death along side the road. Lazarus decides to cure Rae, a woman known for her insatiable desire for sex, of what he thinks are her wicked ways. All the while Rae's true love Ronnie (Justin Timberlake), who is supposed to be headed to Iraq, goes looking for her.

With a tale like that, folks are sure to come up with some interesting ideas for the trailer.

"It's gotten to the point now — almost to a breaking point — where there's a fever that has taken over the festival that creates an enormous amount of chaos and excitement and tension," the 68-year-old actor said in a recent interview with The Associated Press. "It's gotten a little bit harder on me."

Though the festival has become a larger spectacle over the years, Redford has long refrained from criticism about the changed nature of Sundance.

He created the independent film festival in 1981 to bring attention to small-budget films and new talent. Redford named the festival, held annually in the snowy mountains of Utah, after his breakthrough role in 1969's "Butch Cassidy and the Sundance Kid."

His documentary "This Film Is Not Yet Rated," premiering Wednesday at the Sundance Film Festival, is a harsh indictment of the ratings system overseen by the Motion Picture Association of America, the trade group for Hollywood's top studios.

Dick calls the ratings process a form of censorship carried out by unqualified film judges who operate in secrecy, their procedures favoring big studio fare over movies from independent and overseas filmmakers.

"Independent film tends to focus more on sexuality. Studios tend to put out films that have more to do with violence," said Dick, a 2004 Academy Awards nominee for his documentary "Twist of Faith." "Violent films get through almost unscathed, but the ratings have this excessive focus against sexuality that puts independent film at a disadvantage."

"This Film Is Not Yet Rated" examines the history of the ratings system, set up in the 1960s by MPAA boss Jack Valenti, who retired as head of the group in 2004 and gave up control of the ratings system last fall.

Filmmaker Nicole Holofcener warned the Sundance Film Festival crowd she was nervous.

And she proved it in remarks that preceded the premiere of her film "Friends With Money," forgetting to introduce her quartet of stars: Jennifer Aniston, Frances McDormand, Catherine Keener and Joan Cusack.

"Friends With Money" opened the festival to a packed theater Thursday night, with Sundance Institute founder Robert Redford and festival director Geoffrey Gilmore offering remarks before Holofcener came up.

Holofcener thanked many others on the film, executives at distributor Sony Pictures Classics, her casting director and editor, the male co-stars, including Jason Isaacs, Scott Caan, Simon McBurney and Greg Germann.

Then she started to leave, only rushing back to the podium after Gilmore reminded her she had neglected to mention the lead actresses.

The Sundance Film festival may look as though it's gone Hollywood with all the celebrity bashes and corporate logos splashed around town. But those are trappings outside the control of Sundance, which has never wavered from its mission of discovery for new film talent, said Robert Redford, whose Sundance Institute oversees the festival.

At a news conference as the 11-day festival opened Thursday, Redford said Sundance's knack for showcasing films that went on to commercial success drew marketers hoping to share the limelight.

"Once the festival achieved a certain level of notoriety, then people began to come here with agendas that were not the same as ours," Redford said. "We can't do anything about that. We can't control that."

While film fans crowd festival theaters to catch some of the 120 feature-length movies playing at Sundance, this ski-resort town buzzes with parties, concerts and other events to promote products ranging from jewelry and jeans to washing machines and sports-utility vehicles.

One reporter asked Redford if Sundance had evolved into a festival with a "Butch Cassidy" or a "Sundance Kid" personality, referring to the actor's pairing with Paul Newman in "Butch Cassidy and the Sundance Kid."

And Hollywood's much-maligned system of rating movies stars in its own film.

The Sundance Film Festival, the country's foremost showcase for independent cinema, gets under way Thursday with an intriguing mix of role reversals among its cast.

Gore and Nader lead what's shaping up as a powerhouse year for documentaries, always a strong suit at Sundance. Director Davis Guggenheim's "An Inconvenient Truth" chronicles former Vice President Gore's dogged campaign to convince a reluctant society of fossil-fuel profiteers and consumers about the dangers of global warming.

But what was different: He did it for a documentary to air on Sundance Channel, the cable network he founded but seldom appears on.

As the season finale of "Iconoclasts," this hour-long portrait sticks to the format of the five that came before. It brings together a pair of innovators from different creative fields for one to serve as an admiring guide into the world of the other. Like chef Mario Batali on rocker Michael Stipe. Actress Renee Zellweger on correspondent Christiane Amanpour.

Or Redford on Newman beyond his role as screen legend. It premieres 10 p.m. EST Thursday (with additional play dates).

"It was never going to be 'The Paul and Bob Show,"' says Redford, who also executive-produced the series. "Instead, the idea of me presenting a friend who was also a colleague to speak about what inspired him -- his salad-dressing company, his racing interests, his camp for children -- those were areas that I thought were worthy of attention.