Mariah Carey proved she hasn't lost her flair for publicity stunts -- by hopping on a New York City subway train in an evening gown for a photo op designed to boost flagging sales of her new album, Me. I Am Mariah...The Elusive Chanteuse. Mimi tweeted some photos showing her and producer pal Jermaine Dupri hamming it up for the camera on the way home from a charity gala. She's wearing a skin-tight Versace featuring a mega-high slit and low-cut bodice, not to mention a pair of shades to protect her against the underground lighting. She captioned the photo, "Glimpses of our joyride on the 1 train. #SubwayInCouture."