Slap a smile on your face with a new iPhone application.

We know you can't buy happiness, but we did find a free way to guarantee a grin.

The just-released iPhone and iPod Touch application Live Happy guides you through daily activities scientifically proven to boost both short and long term happiness. And with eight different activities, there's one that works for you. Three of our faves:

Are you a list-maker? Tally all the things you're grateful for today. (Thanks, stranger who held the elevator!)

Like yoga? Doing a 15 minute meditation might help you see yourself in a more positive light. (We're picturing ourselves on the beach right now.)

Constantly snapping photos? Keep a "savoring album" of beautiful things you encounter. (The flowers outside our window this morning were particularly enthralling.)

Click here for a free trial. The full version costs $6.99, and a portion of the proceeds go to Live Your Life Well, an organization that aims to help people reduce their stress levels. 

Now doesn't that feel good? You'll feel even better if you share this with your fellow iPhone friends.