Any self-respecting child of the nineties had to make the decision, Backstreet Boys or ?NSYNC, and Britney Spears is no exception. The pop princess posted a photo on Instagram that made it clear she stans for the Backstreet Boys, despite her special connection with ?NSYNC via ex-boyfriend, Justin Timberlake. In the pic, Spears posed with Backstreet?s A.J. McLean late Friday after the former boybander attended her Las Vegas show, ?Piece of Me.