Pitbull and Ke$ha announced Friday they will share the stage for a North American summer concert tour. The series of live shows is to begin May 23 in Boston, with additional dates confirmed through June 28 in Tampa, Fla. Australia\'s dance/pop music stars Justice Crew are confirmed as support for Pitbull and Ke$ha, along with special guest disc jockeys Ultra Records\' Jump Smokers. Tickets go on sale March 29.