I love how ballsy she is with her fashion! It's not my style but I think she looks hot and she was at a Hollywood party, not a family barbeque so I don't think it's inappropriate really.
Also, can we please stop psychoanalyzing the girl for a second? She wore crazy clothes before and she still does, so I don't think there's any reason to say she's "desperate" or "wants attention" or whatever. We don't know what her state of mind is, and I don't think she should have to prove she's happy by smiling every second of the day.
Like everyone else said, I love her makeup...I really like how she tries something new all the time. I get bored of seeing some stars always wear the same neutral makeup.