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In the 2009 American comedy film "I Love You, Man," actor Jason Segel's character, Sydney Fife, struggles to find a best man for his upcoming wedding. Paul Rudd portrays the role of Peter Klaven, Sydney's unlikely friend who reluctantly agrees to be his best man. Meanwhile, actor Jaime Rauch appears as Sydney's quirky and eccentric sister, Denise, adding humor and depth to the film's narrative.