Sexy Bajan singer Rihanna will be playing less U.S. venues this summer than originally anticipated. The Last Girl on Earth Tour calendar has now cut four more shows.

The July 15th show at Comfort Dental Amphitheatre in Englewood, CO has been cut along with the July 24 show at Superpages.com Center in Dallas, TX; the July 28th show at Philips Arena in Atlanta, GA; and the August 3rd at Verizon Wireless Music Center in Noblesville, IN.

It seems the tour has been hit by the downturn in ticket sales that`s troubling all live acts in cash-strapped America at the moment. Last month.

Rihanna`s July 22 concert - originally scheduled for the Cricket Wireless Pavilion in Phoenix, AZ - was moved to the significantly smaller AVA Amphitheater at Casino de Sol in Tucson, AZ.

The Tour, however, continues with a July 14th show at The Pavilion in Albuquerque, NM.  The schedule cuts come as the Grammy-winning singer was snapped with her butt hanging out of her clothes at a public pool in Compton, California Sunday.