Sorry if this sounds rude, but it's sometimes helpful to scroll down the page. If you did so, you would discover that right at the top of the "Community Downloads" section of the forums is a lovely little forum titled "Celebrity Sims" that has a huge collection of celebrity sims for download.

If there's a specific celebrity that you want and you can't find them, post a request in the "Requests" forum, including pictures of the celebrity.