Kelly Osbourne v Christina Aguilera
What's the problem? Kelly and Christina's long-term feud was recently reignited after Ms O made some highly unflattering comments about the pop princess on US TV show Fashion Police. First she criticised Christina's appearance in a tight-fitting Givenchy dress, saying: 'Maybe she's just becoming the fat b***h she was born to be.' A couple of months later, she repeated the 'fat' accusation when asked to comment on Christina's bodysuit-and-fishnets get-up at the Michael Jackson tribute concert. 'She called me fat for years,' Kelly insisted. 'I was never that fat.'Our verdict: Truth be told, we're not so keen on Christina's get-up either - but the 'fat' jibes have to stop, Kelly.