First lady Michelle Obama gives a thumbs-up to students as she joins the cast of Nickelodeon’s iCarly in filming a public service announcement following at a special screening of “iMeet The First Lady” episode of the show, Friday, Jan. 13, 2012, at Hayfield Secondary Schoo in Fairfax, Va. iCarly cast members Jerry Trainor, left back to camera, and Nathan Kress, right. (AP Photo/Cliff Owen)