THREE’S COMPANY?: Riccardo Tisci, who has revved up Givenchy with his hot-blooded and influential designs, has extended his contract with the French house, WWD has learned. According to market sources, the Italian designer recently signed on for another three years as the brand, now under the management leadership of former Prada executive Sebastian Suhl, shifts into an expansion mode to capitalize on the buzz around it. Tisci joined Givenchy in 2005. Givenchy officials declined to comment.