The singers join forces for a weekend concert in Sin City. Plus: Natalie Portman, Gavin Rossdale, Jason Derulo & more!

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The League co-creators Jackie Schaffer (second from left) and Jeff Schaffer (third from left) join cast members (from left) Jonathan Lajoie, Nick Kroll, Mark Duplass, Paul Scheer, Katie Aselton, Stephen Rannazzisi and Jason Mantzoukas for a group photo at New York's Comic Con Saturday at the Jacob Javits Convention Center in Manhattan.