English TV Host Sharon Osbourne, 60 has launched a scathing attack on Singer Lady Gaga, after the pop singer slammed the 60-year-old's daughter, Kelly Osbourne, in a post on her Little Monsters blog. Gaga said that Kelly and Joan Rivers constantly make "jokes about artists and celebrities as if we are zoo animals. Sharon took to her Facebook page to write an open letter to Lady Gaga.'I am calling you a bully because you have 32 million followers hanging on your every word and you are criticizing Kelly,' Sharon writes, asking, 'Are you so desperate that you needed to make this public?'