I think she'll do more than Bieber, she has a more established fanbase, I'd say 350-400k.
Adele sold 261k with just a James Bond track, but with only 3 days. So I guess it all depends on streaming. If she sells 500-600k, then Ariana has to have massive streaming numbers.
Too bad we couldn't have back to back #1 debuts though, that would've been amazing.
