Just to clear the air...that story is based on the character Shelby being a Phi Mu and marrying a KA. If you look closely, you can see the composite and other Phi Mu stuff in her room, However, Julia Roberts was not made an honoray Phi Mu(confirmed by Nationals). Also, the author of the book is a Phi Mu
It really doesn't matter what organization you are(NPC, NPHC, IFc ETC ETC), as long as your happy and get what you want out of it!
I'm proud of Phi Mu's heritage and proud to be one and ofcourse I have friends in THETA, Tri-Delt and Chi-O who think they made "better" choices but that's what they wanted to be. "No matter the letter, we are all greek together"