Carrera appears under the slogan: "I am Adam - I am Eve - I am me". The image is designed to communicate a message of tolerance and acceptance, according to Life Ball organiser Gery Keszler.
"This picture is not about sexuality, as one might expect at first glance. It's about identity, and the fact that there are no limits to human dignity and mutual respect," Keszler told a press conference in Vienna.
Vienna's annual Life Ball is the biggest charity event in Europe supporting people with HIV or AIDS. This year it takes place on 31st May.
LaChapelle's poster will be on display around Vienna, which Keszler thinks is sure to provoke some complaints. "In fact, we're hoping it will. Even my friends in New York can't believe that we're going to do this," he said.
Conchita Wurst's victory at the Eurovision Song Contest is a happy coincidence, Keszler said. She will perform 'Rise Like A Pheonix' live on the main stage at the Life Ball. "She's family - I promised her she would be performing, whether she won or not," Keszler said.
LaChapelle has also been involved in creating the Life Ball's opening show. The theme this year is the 'Garden of Earthly Delights'.
And LaChapelle is designing a car for Audi, one of the main sponsors of the Life Ball. The unique Audi S1 will be auctioned off together with LaChapelle's image of Carrera at the AIDS Solidarity Gala, prior to the Life Ball.
More of LaChapelle's photographic work will be on show at Vienna's Ostlicht gallery from June 2nd to September 14th.