Photoshop gives you that choice, but not PSP.
However, I think you want to know how it will look on the page, go to Print Layout, you can drag your art onto the size paper you are using, in fact you can place several files or the same one at different sizes all on one page in this print preview on steroids, and if you can't finish, you can save your layout for later including the images with it. This is a lot cooler than most programs 5 x's more expensive. PhotoImpact does a similar thing in its print preview.