In what is sure to be one of the hottest tickets of the year, superstars Jay-Z and Mary J. Blige have announced plans for an upcoming 25-date co-headlining tour of North America. Billed as Mary J. Blige & Jay-Z: Heart of the City Tour, the outing will kick off on March 22 at Miami’s American Airlines Arena before moving on to Baltimore, Philadelphia, Boston and Toronto. While only 10 dates have been confirmed so far, more performances are expected to be added in the coming weeks. Tickets go on sale for the intial shows on February 15 on livenation.com, but Citi card members will have access to a presale on February 13 through www.privatepass.citi.com. Mary and Jay have sold a combined 70 million albums worldwide and have won a total of 12 Grammy Awards between them.