User blog comment:Feeling-Chalant/Bloodlines Photos (Bart, Heatwave, Barry, and WALLY?!)/@comment-24.55.161.164-20120601230906/@comment-64.247.101.234-20120601235359

Yes the info came from Cartoon Network. Here's the official post:

http://www.worldsfinestonline.com/news.php?action=fullnews&id=1345