Celestina Warbeck Bio Added to Pottemore
http://www.the-leaky-cauldron.org/2014/8/18/celestina-warbeck-bio-added-to-pottemore
In honor of the fact that it's the famed magical songstress's birthday, J. K. Rowling has updated the "Chamber of Secrets" section of Pottermore to give fans more information about Celestina Warbeck. One of Warbeck's hit songs is also available to be listened to on the site. You can log into Pottermore to read all about Warbeck, and how she's one of J. K. Rowling's "favourite 'off-stage' characters."