I don't know if this is appropriate to post since we now know they are dating but I'll just put it out there so you guys can see it yourself.
Back on September 22, 2010 Perez Hilton did an interview with Selena asking her about her dating life. And of course he had to bring up Justin. Here she again points out that she is 18 and he's only 16. What's more is that she thinks "he's....he's...little