Fansite layout with auto page format

Hello all… I have a fansite, http://kerihilsonfan.com and if you take a look at the “continue” (next page) link, you’ll see that there is quite a bit of white space beneath the posts. I would like my posts to auto adjust, yet still fit within the proportions of the layout; like this site: http://rihannadaily.com How would I go about doing this?

Thanks for your help