Singer Jennifer Lopez thinks it is a pop star's job to push the boundaries, insisting the musik scene would be 'boring' if they didn't. The 41-year-old has defended the likes of pop bintang 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 bintang magazine: "It's part of our job to push the envelope and test the boundaries - if anda don't, it gets boring. "So I cinta everything. I'm an artist and I cinta that's what they do. anda can't ask them to not be who they are."