Who Wore It 'Breast?' Miley and Rihanna's Daring Fashion Picks

It's dueling cleavage as Rihanna and Miley Cyrus try to outdo each other's racy outfits.

Rihanna wore a daring Tom Ford dress at an amfAR charity auction in Hollywood. Strategically placed flower petals barely covered up what needed to be covered.

Meanwhile, Cyrus also made eyes bulge when she showed up at the same event, also wearing Tom Ford. Black strips masked the appropriate areas of her gown's mesh top.

A double dose of sheer showmanship.