LOADING ERROR LOADING “SNL” host Jenna Ortega looped in a special guest ― “SNL” alum and “Wednesday” co-star Fred Armisen ― to give her assistance during her monologue this weekend. The 20-year-old, who stars in the newly-released horror flick “Scream VI,” noted that she’s the youngest host of the “Saturday Night Live” season thus far before she reached further back …