Kiss and Def Leppard will announce a joint summer U.S. tour at a press conference next Monday. No dates have been announced yet. The press conference will streamed at LiveNation.com. The tour is rumored to kick off in late June and run through the end of August, with Kiss headlining and closing all dates. Def Leppard guitarist Vivian Campbell let the news slip earlier this week when he was asked about rumors of a tour.