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It looks like Eddie Lampert, the beleaguered billionaire chairman of Sears/Kmart, has a new secret weapon to revive the company's fortunes: LL Cool J. The struggling big-box chain signed up the rapper to design a children's line called LL Cool J for Sears, according to WWD, which will include items like $22 graphic T-shirts and $50 pairs of jeans. The upcoming ad campaign will feature J with his wife, Simone, and their four kids: Najee, Italia, Samaria and Nina. And to think some investors have been concerned that the company is lacking in big, brand names now that Kmart's deal with Martha Stewart will come to an end in 2010.