Singer Jennifer Lopez thinks it is a pop star's job to push the boundaries, insisting the música scene would be 'boring' if they didn't. The 41-year-old has defended the likes of pop estrella Rihanna, who has recently caused controversy with her racy performances, saying artists like her have to take risks with their stage antics. The On The Floor hitmaker told British estrella magazine: "It's part of our job to push the envelope and test the boundaries - if tu don't, it gets boring. "So I amor everything. I'm an artist and I amor that's what they do. tu can't ask them to not be who they are."