celine dion, elton, and cher. once they happened in vegas, they often stay in vegas. it's called a residency. casinos pay big bucks to secure exclusive rights to a performer for weeks even years. in turn the headliners get to build the show of their dreams, complete with all the vegas pomp and plumage money can buy. >> what's up, vegas? >> reporter: tuesday night sin city pulled out all the stops for its newest recruit britney spears. starting on the 27th, spears will perform for two years at planet hollywood, nearly 100 shows total. for a reported $30 million. >> in vegas we're always looking for top entertainment, right? the value isn't having big name artists in the city on the properties promoting a hotel and a casino. >> reporter: he helped negotiate the deal. >> the residency business is great for tourism for these