Yesterday a group of 8 autistic children graduating from P.S. 37 had a treat in store as Jennifer Lopez stood amongst the audience. The school is in Staten Island's Great Kills neighborhood, and the 10 and 11-year-old kids were performing her song and dance routine for "Let's Get Loud." SI Live reports on the singer's cameo.The class was first introduced to Lopez's music a few months ago when they had to choose a song to......