Mariah Carey brought the house down with a powerful New Year's Eve performance. The Grammy winner, 56, sang "Obsessed" during the Wednesday, December 31, broadcast of Dick Clark's New Year's Rockin' Eve With Ryan Seacrest. While Seacrest, 51, and Rita Ora hosted the ABC special live from New York City's Times Square, Carey performed in Las Vegas for an adoring crowd. She strutted onstage in a sparkly silver-and-pink minidress and silver boots, her hair falling over her shoulders in beachy waves.