Never saw this one coming. Song of the Summer Chris Pratt has been tapped to host the 40th season premiere of Saturday Night Live on September 27th, with Ariana Grande as the musical guest. The hosting gig will be a coronation for Pratt, whose Guardians of the Galaxy will most likely finish the year as Hollywood’s top-grossing film. He’ll step out onto that stage, mock his new superstar status, and then appear in a series of mediocre sketches that he’ll no doubt elevate with his undeniable Chris Prattness. We can’t wait.