Justin Bieber finally earned his first number one single with “What Do You Mean?” and now he’s getting his homegirl Ariana Grande to lace the remix. The 21-year-old pop star shared a few tidbits about the upcoming remix on Twitter. Ok. Preorder Friday. Let's do it. Ok by you @ArianaGrande? #purpose #nov13 #remix #PreOrder pic.twitter.com/Cy0TSsZtRt — […]