The starlets both chose looks from Tom Ford’s “Sex on a Plate” spring 2015 collection, which recently debuted at London Fashion Week, for this year’s amfAR Inspiration dinner in L.A.
Miley chose an all-black ensemble featuring pants on the bottom and straps on top that barely covered her cleavage.
Rihanna was just as scantily clad, wearing a white gown with sheer fabric over her bosom… her modesty intact, thanks to purple pasties.
"Extra's" Renee Bargh was on the red carpet with Miley, who was chatting about recently being named spokesperson for MAC Cosmetics' Viva Glam campaign, which helps people living with and affected by HIV/AIDS.
Miley also chatted about her plans for Halloween and told a story about her neighbor's crazy Halloween decoration that involved a Miley Cyrus skeleton hanging from a tree. Watch!
For more pics of Miley, Rihanna and other stars at the event, check out our gallery!