iPhoto Has 1 Notification - OS X 10.9 Mavericks

I updated to OS X Mavericks and ran all the updates for all my Applications and now my iPhoto has 1 red bubble notification that I can't find out how to get rid of. Everything is up to date, I've opened and restarted iPhoto several times, I've rebooted, I've removed and reassigned the iPhoto alias to the dock (which I had to do to get the new blue iPhoto icon). Nothing has worked. I did see that someone tried sharing a photo with me or a photo stream or something in my Notifications but I have never done that before so I don't know if that could be causing it. Either way, I can't find a way to get rid of it. And iPhoto isn't in the System Preferences > Notifications list.