So if I'm to understand the video, in the beginning she's with her bunch of friends that are "keep it real", you know, down to earth, no time for the fame friends.
Then, this guy comes and takes her pictures and she finds out she in fact likes it despite her initial front.(hence the fame)
She gets famous, and then one of her "real" friends comes to see her, and the photographer puts down his number on his hand like he did with Rita.
Rita sees him (dark-haired friend) storm out, angry that the guy would even think that he's interested in fame. This hits Rita hard and she begins to reminisce on all of the worst times of her career...she wants to just go back to those "real" friends who don't care about fame and success.
However, as she catches up to him, he's doing the exact same thing she did...getting his pictures taken, craving the fame. He's no better than her so she just runs away from everything.
I think the whole video is about how fame is really appealing and how you can lose your real friends in the process.
Or maybe I just typed up a whole load of bs! I don't know...