According to Official Guinness Records,
The world's most expensive bra is the $12.5-million (£8.5-million) Heavenly Star Bra, by Victoria's Secret, created in 2001. It features 1,200 Sri Lankan pink sapphires and as its centerpiece a 90-carat emerald cut diamond that was worth $10.6 million (£7.28 million) alone at the time. The 2005 Sexy Splendor Fantasy Bra also had a $12.5-million selling price, though in comparative terms its value is less than that of the 2001 bra. Both bras were part of the Victoria's Secret Fantasy Bra line.
For a complete list of 2001 records, please visit 2001 Guinness Records in United States.