Justin Bieber-pick Me (with On Screen) -

Ariana Grande (specifically her 2011/2012 Yours Truly era style) or Jordin Sparks .

The featured artist would sing a bridge or a new verse from the perspective of the girl being serenaded. Justin Bieber-Pick Me (With on screen)

Since the song's core message is about being a girl's "number one fan" and the only man she needs, a perfect feature would be a from the same era to provide a "response" verse. Ariana Grande (specifically her 2011/2012 Yours Truly era