Showtime has confirmed recent rumors, officially announcing that it will be launching a standalone Internet streaming service next month. The service will follow in line with HBO's recent embracing of the Internet (as well as Dish and many networks with its Sling TV), and it will be called simply "Showtime". Apple will be the first partner for the service, CBS Corporation announced this evening. The standalone Internet-based Showtime service will go live some time in early July. More after the jump.