Due for release in America on 10 July, the film follows the same outrageous formula which Baron Cohen used for his critically-acclaimed production, “Borat”.
A few hundred fans were invited to watch 22 minutes of selected scenes at the South by Southwest festival in Austin.
The actor’s performance won rave reviews among audience members, many of whom predicted the film will be even more successful than “Borat”.
Robert Perez, a film critic for MTV, wrote: “Bruno somehow makes Borat look like child’s play, upping the anti on aggressively offensive, squirm-worthy hilarity.”
Instead of an ignorant and offensive Kazakh television journalist who offends Americans, Bruno’s character is a flamboyantly gay fashion correspondent attempting to conquer Hollywood and become "the most famous Austrian since Adolf Hitler".
In the first piece of footage, Bruno tries to become famous by adopting a black baby, then attempting to involve the infant in a fine arts project.
As he grills parents of prospective child stars, he fires off typically outrageous questions. Queries such as: “Would they be okay with being dropped off a four-story building, or willing to have liposuction?” drew roars of laughter from the enthralled audience.
Other scenes find Baron Cohen’s screen character appearing on a Jerry-Springer-style talk show in leather trousers, seeking Mr Right.
The vast majority of audience members, who are black, are disgusted by his over-the-top homosexuality. They become apoplectic when Bruno brings out a picture of the child posing as Jesus on a cross.
In the closing scene, Bruno reinvents himself by changing his name to “Straight Dave”.
Dressing like Ted Nugent with long hair and a scruffy beard, he stages an outrageous mix-martial arts contest as a satirical take on the Ultimate Fighting Championship.
As soon as Bruno’s ex-boyfriend crawls into the ring the pair kiss passionately, stripping off and gyrating against one another, much to the crowd's disgust.
Baron Cohen, who first introduced Bruno’s character in Channel 4’s Da Ali G Show, has settled in Los Angeles with his fiancée, the Australian actress Isla Fisher.