280706_johntaaustin.jpgAccording to an article on Billboard.com, SoSoDef signing Johnta Austin has co-written several tracks on Janet’s upcoming album 20 Years Old. Johnta’s previous co-writing hits include Mariah Carey‘s We Belong Together and Jessica Simpson‘s current single A Public Affair. He has also worked with Mary J. Blige, Enrique Iglesias and Chris Brown.