BlackBerry Community have been waiting for Instagram since BB10 was launch, even thought the official Instagram is not available yet there is IGrann:

A quick video showing iGrann, a native instagram client for Blackberry 10. In this video:
* Splash Screen
* Log In Screen with auto complete of saved account
* Feed Page with Modern Design
* Like Media
* Unlike Media
* Play Video
* Feed Scrolling
* Feed Update
* Explore Page
* Explore Scrolling
* Search User
* Search Hashtag
* Photo Upload with editing options