Charlize Theron Vs. Mariah Carey: Who Wore It Better???

Left: Mariah Carey in a cleavage-baring dress atop a piano at the BET Honors in February.
Right: Charlize Theron in a dazzling Dior gown at the Oscars tonight.
Both ladies rocked black gowns with deeply plunging necklines, but we wanna know….
[poll=60476]
[Image via WENN/AP Images.]