I'm sorry.. I don't like Miley. She made me angry :/ from "disney stars" I can stand only Demi Lovato... others annoy me :? horrible for me.. sorry it's my
It's just a facial expression. The outfit was inspired by Queen Elizabeth I, therefore she was acting royal and had a sensible look on her face. Its not to say she didn't enjoy meeting Miley.
It's showing how she was super happy and smiley meeting Avril but with Miley Cyrus she's almost pouting.... I don't really get it, I'm sure she loves both of them equally!