This was recently released, read the caption underneath the photo......
<a href="http://www.flickr.com/photos/51418611@N05/8807033902/" title="obama-prom-photo-1979 by bocachica64, on Flickr"><img src="http://farm4.staticflickr.com/3735/8807033902_5a0961f014.jpg" width="500" height="333" alt="obama-prom-photo-1979"></a>
President Obama, second from right, on prom night, 1979 (Courtesy of Kelli Allman/Contact Press Image)
<a href="http://www.flickr.com/photos/51418611@N05/8807033902/" title="obama-prom-photo-1979 by bocachica64, on Flickr"><img src="http://farm4.staticflickr.com/3735/8807033902_5a0961f014.jpg" width="500" height="333" alt="obama-prom-photo-1979"></a>
President Obama, second from right, on prom night, 1979 (Courtesy of Kelli Allman/Contact Press Image)