Today on Twitter, somebody had Chris Brown all wound up. The hip-hopper insinuated, via tweets, that he's moved on and learned from his past ... And we can only assume that means his abusive relationship with ex Rihanna, which inevitably comes up time and time again in interviews. Elsewhere on the tweet-wide web, Demi Lovato celebrated her 19th birthday, David Archuleta admitted that his mom still cooks for him, and Pia Toscano shared just how much she loves 'I Love You This Big' hitmaker Scotty McCreery. See what your favorite stars were tweeting today!