In one of the swiftest rounds of fashion musical chairs in recent memory, Celine announced Hedi Slimane would be leaving his position as the label's artistic director, but his post wasn't vacant for long. Hours later, the brand named Mr. Slimane's replacement: Michael Rider, a former design director at Celine who most recently oversaw Polo Ralph Lauren's women's wear. 'I am delighted to welcome Michael back to Celine,' said Severine Merle, Celine's chief executive, emphasizing his strong connection to the brand's heritage.