for me personally i think that has to be Selena Gomez, i grew up my entire teens listening to her music with her band The Scene (at that time) and also watching her on tv in wizards of waverly place
but if i have to name a british artist
it'd be Pixie Lott for me personally, i adore her easy listening pop songs and i was stanning her massively hard when she did strictly (i cried so much when she got eliminated unfairly still if you ask me)
and regarding my own nation Netherlands, i am 110% devoted member of the Maanhang fanbase