DITTO THAT: Beth Ditto is set to rock Milan Fashion Week. The American singer will perform live at the Versus show, to be held at Versace’s headquarters on Friday at 10 p.m., right after the signature brand’s show. “I’m a big fan of Beth’s voice and energy,” said Donatella Versace, who designs the Versus line with Christopher Kane. “Beth has an absolutely fearless attitude, the same animating Versus. It will be a fabulous night of fashion and music. I can’t wait for it to be Friday.”