J-Lo at Obama Super Bowl Party (AFP)

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Actress and music diva Jennifer Lopez, pictured in January 2011, will top the bill at US President Barack Obama's annual Super Bowl party on Sunday, as the Green Bay Packers take on the Pittsburgh Steelers for the NFL championship.(AFP/Getty Images/File/Frederick M. Brown)AFP - Actress and music diva Jennifer Lopez will top the bill at US President Barack Obama's annual Super Bowl party on Sunday, as the Green Bay Packers take on the Pittsburgh Steelers for the NFL championship.