It looks like Rihanna might be the "Last Girl on Earth" people want to see in concert. Dates for her 2010 tour were cancelled due to low ticket sales, and she's still having problems filling arenas. Page Six is reporting that domestic dates for her "Loud" tour are being cancelled. "It has been a big disappointment," the source told Page Six. "The ticket sales in big US cities like Boston are so bad, they will barely cover basics like the lighting and other arena costs. Tour managers are begging local radio stations to do giveaways."