Kelly Rowland - Kelly Rowland Leaves 'X Factor UK' In The Lurch

The former Destiny's Child star fell out with the N-Dubz member following accusations on Saturday night that Rowland protege Mischa Bryan had been "bullying" other contestants - barbs that hadn't even been made by Contostavlos. In fact it was Louis Walsh who'd made that claim, though he was eagerly backed up by 23 year-old - something which has apparently galled her fellow judge. A source told The Sun, "She was expecting to bury the hatchet with Kelly on Sunday night. Kelly was having none of it. She had a major sense-of-humour failure - and was trying to suggest Tulisa was deliberately trying to destabilise her."

Either way, it's not good news for Rowland's girls Bryan, Sophie Habibis and Janet Devlin, who find themselves without a mentor half way through the week. More worryingly for the show's bosses it comes at a time when they're already debating replacing last original judge Louis Walsh, again according to The Sun. "We don't know where she is," admitted an Itv1 source. The news is fuelling speculation Simon Cowell could return to the hot seat in the near future.