The 2-year contract calls for 48 shows a year at Planet Hollywood. According to the contract, Britney will earn $310,000 per show. Britney's cut of the gate is huge -- projected sales per show are $508,514, meaning Brit will be snagging more than 60%.

As we reported, producers are shooting for a "cool, hip club-like show" ... unlike the run-of-the-mill Vegas shows that preceded it. It starts in December.