Three words: Dressed. To. Kill.
All eyes were on the 26-year-old singer in her risqué cut-out gown (from Ford's Spring/Summer 2015 show) complete with thigh-high split and barely-there embellished bralet as she presented the designer himself with amfAR's Inspiration Award.
Check this pose.
FYI this is exactly how to do smouldering rock chick at any black tie event (note the 10 denier stockings, the rouge lip and the metallic platform heels) and how to outdo every other guest there.
Rihanna wasn't the only lady decked out in Tom Ford though - Gwyneth Paltrow, January Jones and Miley Cyrus (think dominatrix strapped bodice) were all dressed to the nines in his signature sexy wares.
When she wasn't rubbing shoulders with Justin Timberlake and the fashion designer at the dinner table, Rihanna was blowing BIG monies during the evening's auction.
We're talking $35,000 (£21,900) on Harry Winston diamond link earrings - think 72 diamonds set in platinum - and $100,000 (£62,550) on the photograph "Elizabeth Taylor at the Eden Roc" by Willy Rizzo, signed and numbered by the artist himself.
She outdoes Miley in a boob-flashing dress, then splashes her cash on diamonds and art. Oh, the life of Rihanna.
WATCH: Catch up on all the latest from last night's star-studded event right here.