A non-profit advocacy group is urging Jennifer Lopez to end her endorsement of the Italian car company FIAT -- or stand accused of supporting Iran's illegal nuclear missile program. In an open letter released Thursday, the United Against Nuclear Iran group told Lopez that by her endorsing Fiat, she serves as a spokesperson for a company that freely does business with a regime that is developing an illegal nuclear weapons program, financing and sponsoring terrorist groups, has killed American and NATO soliders, and is recognized as one of the world's leading human rights violators. As of now there has been no comment from Lopez or her representatives.