The shock value, crazy costumes, and adoption of the gay community made her truly this generation's replication of Madonna and Interscope ran with it from day 1.
why [current] Selena? She seems to be making the music she wants, not giving a damn about they do on the charts or performing them, going by the image she wants to be perceived by etc
I prefer My Everything to Yours Truly but I have to admit her vocals in ME was way different and worse than from YT's. Her label must have let her sing like that in My Everything and all they got was one of the most commercially successful in 2014.
Mariah was until she split from Tommy, Beyonce until 4, Britney and Rihanna since day one and haven't left. Most Disney stars, Demi and Miley seems to have broken out though.
I don't count people who manufactured themselves so Taylor, Katy etc don't count