New Delhi: Bollywood actress Aishwarya Rai Bachchan, who is busy with the ongoing 66th Cannes International Film Festival, is extending her stay in the French riviera to attend a fashion show for amFar (The American Foundation for AIDS Research)."The Ultimate Gold Collection Fashion Show" for AIDS research will see Aishwarya walking the red carpet dressed in an exquisite gold-themed outfit designed by Tarun Tahiliani.Aishwarya, who is at Cannes as the ambassador of leading cosmetic brand L'Oreal Paris, has been a supporter of AIDS research and has attended the amFar event at Cannes a couple of times now.She has made arrangements to extend her stay at the movie extravaganza so that she could attend the fashion fundraiser Thursday. Aishwarya will also participate in the auction, proceeds of which will go towards AIDS research.Aishwarya has been asked to wear a gold-themed Tarun Tahiliani outfit for the gala since he is going to be the only Indian designer showing his creations at the Ultimate Gold Collection Fashion Show.The annual star-studded event, which draws in the creme de la creme of international cinema, is celebrating gold this year. As part of a unique fashion show, forty top models will showcase a collection of gold gowns and jewellery from legendary and emerging fashion houses across the globe.