Ariana Grande is the new princess of pop, topping the charts with her addictive single “Problem,” impressing critics with her thick, gliding vocal range and maintaining an image that her young Nickelodeon fans can vibe with, signature ponytail and all. Grande said she hasn’t had much time to “sit back and realize and just enjoy” her musical breakthrough, and what’s coming next may not allow any time for it. “What’s so attractive about Ariana is, No. 1 she’s an extraordinary talent, No. 2 she’s an exceptional actress, and the third part of it — which makes her a triple threat — is she has this wildly successful fan base on the Internet unlike anything we’ve seen in some time,” said Monte Lipman, the CEO and chairman of Republic Records who signed Grande when she was 17.