The cast of hit Tv drama Pretty Little Liars received a visit from very special guest on Thursday (19Jun14), when the youngest daughter of U.S. President Barack Obama and First Lady Michelle Obama stopped by the Los Angeles set. Sasha Obama, 13, and a friend got the chance to hang out with the stars and chat to them in between filming, reports Tmz.com. The teen's trip took place days after it emerged her older sister Malia had landed a week-long gig working as a production assistant on Halle Berry's new Tv show Extant.