Door Problems

I was getting in my car today and I went to close the door and for some reason it didn't "latch" or close all the way. There was nothing blocking the door from closing all the way. I was able to close it by grabbing the inside handle and pulling. When I get out I had to shut it with my hip to get it to latch. It's never done this before. Does anyone know what the problem could be and how to fix it?

Check to see that the latch on both the door and the body are tight. They can vibrate loose and make things funky.

Yeah, and make sure that they're lining up. But you'd do that if they were loose, too....(right?)