SUGARLAND's JENNIFER NETTLES will perform for President OBAMA twice this month. Jennifer and partner KRISTIAN BUSH are set to sing a holiday song for the Commander in Chief at the Christmas in Washington special, airing Sunday, December 20th on TNT.  Last Sunday night, Jennifer joined BEN HARPER at the Kennedy Center Honors in Washington, singing a medley of BRICE SPRINGSTEEN songs with President Obama in the audience.  An edited version of that ceremony will be broadcast Tuesday, December 29th at 8:00 CST on CBS.