If you thought that it’s been too long into 2013 without a celebrity feud, fret not – the Osbournes are here to oblige.

According to TMZ, however, it was really Hollywood’s resident drama queen, Lady GaGa, who started this one. In an open letter to Kelly Osbourne, dated January 10th, Gaga criticized Kelly Osbourne’s work on E!’s Fashion Police, saying that “it glorifies her and Joan Rivers pointing in the camera, laughing, and making jokes about artists and celebrities as if they are zoo animals.” Too harsh? Perhaps, but Sharon Osbourne’s subsequent involvement in the “feud” certainly took it to a whole new level.

In her own response to the open letter, Kelly’s mother says that the backlash against her daughter following Gaga’s letter has been awful and has even included death threats from Mother Monster’s devoted following. Osbourne, obviously keen to step in, wrote to Gaga: "A word from you would stop all this hideous, negative and vile threats from your 'little monsters." And if you think that’s justified, the letter does go on to feature some quite personal insults: "By your actions to Kelly right now, you have shown me that you are nothing more than a publicity seeking hypocrite and an attention seeker." Gaga’s letter could have been described as mature, but this newest one by Sharon? It probably takes the whole thing into full-blown feud territory. Well, we all know the Osbourne family has some experience with those.