Rapper Nicki Minaj will head out on the road as an opening act for Rihanna’s 2010 Last Girl On Earth tour of North America. The 25-date tour begins July 2nd at the White River Amphitheater in Seattle, Washington and ends August 25th at the United Center in Chicago, Illinois. The tour will be a “visual spectacle on a scale unlike anything she has accomplished in her already legendary career,” a representative for Rihanna said in a press release today (April 5th).At press time, Rihanna, who was discovered by Jay-Z, is the only female artist in the past decade to have six #1 singles on the Billboard Hot 100. “We’ve never done a tour to this capacity. The production is unbelievable and the costumes, we just took it to a whole new level,” Rihanna said in a recent interview. “Visually and sonically it’s going to be a big step up from the last time. We just keep growing and this time it is a massive production that I cannot wait for.”The news comes as Rihanna begins her sold out tour of Europe, which starts on April 16th in Antwerp, Belgium, to promote her album Rated R. Rihanna’s tour dates are listed below: Jul 02SeattleWhite River AmphitheatreJul 04VancouverGeneral Motors PlaceJul 06CalgaryPengrowth SaddeldomeJul 09SacramentoARCO ArenaJul 10Mountain ViewShoreline Amphitheatre at Mountain ViewJul 14AlbuquerqueHard Rock Casino Albuquerque presents The PavilionJul 15DenverComfort Dental AmphitheatreJul 17Las VegasMandalay Bay Events CenterJul 21Los AngelesStaples CenterJul 22PhoenixCricket Wireless PavilionJul 28AtlantaPhilips ArenaJul 30TampaFord AmphitheatreJul 31MiamiAmerican Airlines CenterAug 03IndianapolisVerizon Wireless Music Center IndianapolisAug 05TorontoMolson Canadian AmphitheatreAug 07MontrealBell CentreAug 08BostonComcast CenterAug 11UncasvilleMohegan Sun ArenaAug 12New YorkMadison Square Garden Aug 15WantaghNikon at Jones Beach TheaterAug 18CamdenSusquehanna Bank CenterAug 20BristowJiffy Lube LiveAug 21HersheyHersheypark Stadium Aug 22DetroitDTE Energy Music TheatreAug 25ChicagoUnited Center