You don't need to wear underwear to sell underwear!

Alessandra Ambrosio flashed lots of skin -- and went commando -- as she showcased this year's Victoria's Secret Dream Angels Fantasy Bra in Las Vegas on Thursday.

The Brazilian beauty looked red hot in a fiery backless dress with a plunging neckline and sheer paneling along the side. Meanwhile, fellow Angel Adriana Lima sparkled in a beaded midnight blue gown.

The sexy supermodels posed for pictures next to their $2 million Fantasy Bras, which are handset with rubies, diamonds, blue and light blue sapphires strung together with 18K gold. 

"This year, it's really exciting because it's the first time that we're going to have two Fantasy Bras on the fashion show," Lima said on "Today" earlier this month. "I'm honored to be here with Alessandra, doing the show, walking the runway together. I cannot wait."

"We work out really hard for the show so we may as well have fun in those beautiful, amazing Dream Angel Fantasy Bras," Ambrosio told "GMA." "It's going to be the sexiest night on television." 

Adriana and Alessandra will wear The Dream Angels Fantasy Bras on the runway at the 2014 Victoria’s Secret Fashion show, airing Tuesday, December 9th at 10 p.m. EST on the CBS.

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