No, Jennifer Aniston doesn't have an outie belly button, as you can see in the image below!
It isn't supprsing that Jennifer Aniston doesn't have an out belly button, as only 90% of people do. This outie look, or protrusion as it is officially know, it merely a result of excess scar tissue left from the removal of the umbilical cord.
Unfortunately, I can speak from experience that an outie belly button doesn't give you magical powers. Although there is a bit of a stigma attached to having one.
As a result of this, some people even have surgery to have it removed. It's possible that Jennifer Aniston did this, but I think it's unlikely.