In this exclusive behind-the-scenes footage, artistic director and choreographer Liz Imperio – a Latin dance specialist who's also worked with Madonna, Gloria Estefan and Lopez's ex Marc Anthony – reveals the hard work she and Lopez, 43, put into the routine for "Let's Get Loud."
"I think this number … is probably the hardest number that I've ever had to do in my life," says Lopez, who's been working with Imperio since her first concerts 11 years ago. "[I've] never done anything like this."
Lopez will be on the road in the U.S. with Enrique Iglesias through Sept. 2 before she heads to the U.K. and Europe. "This is my dream," she says. "This is what I've always wanted to do."