Any fan of classic pop music of the ‘80s, ‘90s and ‘00s is a fan of Diane Warren—but they might not know it. Perhaps one of the most gifted and prolific songwriters of all time, Warren has been behind some of the career defining hits of acts like Aerosmith, Beyoncé, Toni Braxton, Justin Bieber, DeBarge, Kelly Clarkson, Celine Dion and many more.