Miley Cyrus' 17th birthday isn't until Monday, but for some reason she threw herself an 80s-themed party on Wednesday night in NYC. Miley apparently dressed up in Julia Roberts' hooker ensemble from Pretty Women. The rest of the family also joined in on the fun. Billy Ray went as Edward, Noah Cyrus went as Kit De Luca, and Trace Cyrus dressed up as the horse Vivian meets at the polo game. No, only Miley dressed up.

Page Six says that rape-eyed Constantine Mouralis performed a few numbers from Rock of Ages for Miley. A source said, "Miley had seen the show two weeks ago and loved it, so her mom Tish brought the cast in to surprise her. But I'm not sure who was more into Constantine -- Miley or her mother." Where's the option for "all of the above"?

While it seems about right that Miley would dress up as a Hollywood Blvd. prostitute, are we sure that she wasn't just wearing her regular clothes? I mean, even Julia Roberts' ho outfit is pretty conservative for Miley. CASE IN POINT:

Billy Ray, you are excused!