Ariana Grande

MUY GRANDE: Republic singer Ariana Grande's single "The Way" f/Mac Miller has flown to #1 at iTunes, and the singer-actress (she played Cat Valentine on Nickelodeon's Victorious and reprises the role on the iCarly spinoff Sam & Cat) has gotten a nice boost from the kidnet and from Radio Disney, both of which tweeted enthusiastically about the song and drove throngs of followers to it. These tweets, of course, followed on the heels of this morning's online premiere from Ryan Seacrest,who also first unveiled Demi Lovato's "Heart Attack"--driving that song to #1 at iTunes as well (it's holding tough at #10 now, btw). Props to Charlie Walk and team on the Grande rollout. (3/25p)