Glitter and bare skin at Vienna’s City Hall

LIFE BALL Guests in fancy costumes arrive for the opening ceremony of the 20th Life Ball in front of the city hall in Vienna, Austria, on Saturday, May 19, 2012. The Life Ball is a charity gala to raise money for people living with HIV and AIDS. AP/RONALD ZAK

VIENNA — It’s Vienna’s biggest party — and its most outrageous — where guests in tuxedos rub shoulders with others wearing little more than body paint.

But despite the revelry, the city’s 20th annual Life Ball on Saturday had a serious purpose — raising money for AIDS research and helping victims infected with the HIV virus.

The celebs attending include actress-model Mila Jovovich, supermodel Naomi Campbell, actor Antonio Banderas and fashion designers Angela Missoni and Eva Cavalli .

Also taking part is former U.S. President Bill Clinton who thanked organizers for donating to his foundation’s drive to prevent the birth of HIV-infected children in developing countries.