The amazingly over-the-top pool and dramatically-lit grotto at Drake's equally over-the-top Hidden Hills estate are in for an incredibly busy summer if this past weekend is any indication. TMZ says that the actor/Canadian/rapper hosted a giant pool party for between 500 and 600 friends, including Kanye West (no Kim??), rapper The Game, Amber Rose, and Laker Nick Young. Guests could choose among activities including flying down a huge, inflatable waterslide; jumping in a pool-sized foam pit; or bellying up to one of the bars, including "separate bar just for doing shots." Such hospitality!