Ariana Grande Swarmed by Fans While Seeing BF Ethan Slater in 'Spamalot' On Broadway

Ariana Grande's supporting her boyfriend, Ethan Slater, by hitting Broadway to watch his latest role in "Spamalot" -- and that means coming face-to-face with tons of her fans for the first time in a long time. The crowd was waitin' for the singer…