Round image widget not round

Hi i have the deluxe image widget in the sidebar on my site. I want the image to be round. So i've set it to round in the widget but the image still stays square? Do you know why this is happening? Is there another widget that will work? My site is still not finished, so it's got a coming soon front page. Let me know if you need to see the site and i'll remove the coming soon. Thanks Carl