The whole point of #2InstaWithLove is to show Instagram developers how much Windows Phone users want to have a native version of the app available. Sure, there are third party downloads available, but these are really Instagram substitutes that don't do everything that Instagram does. One recent third party app that had just about everything included but the photo filters, Itsdagram, was pulled after just a few days. Developers said that there were a few missing functions it needed to work on.
You can find #2InstaWithLove in the Nokia Collection, or by clicking on the sourcelink below.
source: #2InstaWithLove via WPCentral