Awards Go Behind the Scenes of J.Lo's AMA Rehearsal By ETonline Staff 8:49 PM PST, November 26, 2013 Jennifer Lopez gave a show-stopping performance at the American Music Awards when she paid tribute to Celia Cruz, and we have exclusive, behind-the-scenes video of the strenuous rehearsals."I've worked with some amazing talent," said choreographer Liz Imperio. "I've worked with Madonna; I've worked with Gloria Estefan; I've worked with Cher ... Jennifer is a beast all unto herself."Related GalleryAMA Stars Instagram Who They Forgot to Thank J.Lo's beau, Casper Smart, acted as creative director, matching Jennifer's intensity in getting the performance just right."I'm really hands on today, because I need to make sure that the look of the show is presented on camera as it is on stage," he said.NUVOtv covered J.Lo's rehearsal for the series A Step Away, which is executive produced by J.Lo.