how do you hold your mouse?

Using a computer for over 10 years, I have never noticed how the tip of my pinky finger sits on the mouse pad while all my other fingers are on the mouse. Today, after working for 6 hours straight with no break, my pinky finger's joint started locking up and hurting. This was when I realized how much pressure was going into my pinky finger! I started wondering if I was holding my mouse oddly and if there was a "correct" way to hold your mouse. I did notice that placing the tip of your pinky finger on the mouse pad gives extreme control over your mouse when you design.

How do you hold your mouse?