Ariana, Scooter hot

WHEN YOU’RE HOT, YOU’RE HOT: Wow—Republic’s Ariana Grande has three of the top four singles at the iTunes store in front of her 8/25 album release: #1 “Big Mistake” f/Big Sean; #3 “Bang Bang,” her collab with labelmates Jessie J and Nicki Minaj; and #4 “Break Free” f/Zedd. All three tracks will appear on said album, whose title, My Everything, could be applied to the pint-sized diva’s giant chart footprint. The heat extends to management; Scooter Braun reps Ariana, while his associate Troy Carter handles Epic’s Meghan Trainor, whose “All About That Bass” holds the #2 slot. That’s the music-biz equivalent of hitting for the cycle. (8/13a)