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Justin Timberlake for McDonalds
The singer recorded "I'm Lovin' It" in 2003 -- and made about $6 million courtesy of the fast food chain, which sponsored his tour and used him in ads. But the money wasn't enough to sooth Timberlake's spirit -- four years later, he said he regretted signing the deal. After all, that took away the artistic integrity he brought to such epics as "D*** in a Box."