Just to share, I found this app WEBSTAWIDGETS:
First, you just have to log in to your Instagram account. You must authorize the app to proceed. You should then receive an email to confirm your email address.
After you verify your email address, you will then be able to start creating your widget.
You will name your widget and the website where you are putting your widget on. After you customize and choose your preferred settings, you just have to click CREATE WIDGET. This will then generate codes for you.
You just have to copy and paste this to your blog.
Remember, when you are inserting HTML codes to your blog post, you must be on the HTML mode instead of the COMPOSE mode.