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Rihanna donates big to AIDS charity

Rihanna splashed out $US135,000 ($A146,064.38) at an auction to benefit AIDS research at the star-studded American Foundation for AIDS Research (AmfAR) Inspiration gala in Los Angeles on Wednesday.

The Diamonds hitmaker bid $100,000 on a vintage print of late actress Dame Elizabeth Taylor, the co-founder of amfAR, and $35,000 on diamond earrings during the benefit event.

Justin Timberlake bought a Damien Hirst painting, while Miley Cyrus, who almost exposed her breasts in a bondage-style outfit, also bid on a print. All donations help fund amfAR's AIDS research programs.

Gwyneth Paltrow hosted the gala and Cyrus made a speech about raising AIDS awareness. Rihanna later took to the stage to present the night's honouree, fashion designer Tom Ford, with his Inspiration Award. He was given the honour in recognition of his career and his commitment to fighting the AIDS crisis.

Guests, who spent at least $3,000 on a ticket, also included Sharon Stone, Milla Jovovich, Kelly Osbourne, Lea Michele, Eddie Redmayne, Michelle Rodriguez, Kristin Davis and Kat Dennings.