Arrivals for amfAR's Cinema Against AIDS gala held at the Hotel du Cap Eden Roc during the 64th Annual Cannes Film Festival. (May 19, 2011)

*Janet Jackson and Bill Clinton are among the star power set for the world famous Life Ball in Vienna this weekend, one of the biggest AIDS charity events on the planet.

This year’s party will mark the 19th edition of the Life Ball and also 30 years since the discovery of the AIDS virus, HIV.

Alongside former US president Clinton, long a regular guest, will be UNAIDS chief Michel Sidibe and US actress Brooke Shields, with musical interludes by singers Jackson and Natasha Bedingfield, and violinist Nigel Kennedy.

The glittering Opera Ball may be the most exclusive and elegant of the hundreds of balls held every year in Vienna, but the Life Ball is by far the most extravagant, with guests dressing up in the campest and most outrageous of costumes.

The evening will begin with a gala dinner at the Imperial Palace sponsored by Austrian President Heinz Fischer, with tickets priced at up to $3,575 apiece.

Last year’s Life Ball raised over $1.9 million for international and national HIV and AIDS projects.