Each year, the amFar Inspiration Gala raises money for HIV/AIDS research with help from some of the world’s biggest stars.
It's also a veritable parade of eye-popping fashion, as celebrities don their glitziest ensembles for what has become a strictly A-list soirée.
Miley, 21, wore a sheer black Tom Ford dress with a bondage-inspired bodice to the event, which honoured the designer’s philanthropic contributions to amFAR.
Meanwhile, Rihanna – who spent more than $135,000 on amFAR auctions – slipped into a cleavage-baring white dress with purple sequins on the bust.
Other celebrities were more modest in their fashion choices – like Gwyneth Paltrow's cut-out tuxedo and Sharon Stone's black jumpsuit.
See all the looks below!