Lady Gaga's 'Monster Ball' to Gross Nearly $200 Million Worldwide

Lady Gaga quickly became one of the most recognizable artists on the planet in 2009, but by the end of that year, relatively few people had seen her perform live. That changed this summer, as Gaga embarked on her first arena tour.

The pop phenomenon hit North American shores on June 28 in Montreal and visited cities such as Boston, New York, Toronto, Dallas, Houston, Los Angeles, San Jose, Vancouver, Edmonton and Philadelphia during the early part of the trek. Gaga will continue to play the nation's largest and most prestigious venues until Sept. 19, when the show heads back to Europe.