'X Factor' bosses are reportedly planning on bringing back some of the show's most eccentric former contestants for a special one-off performance on this year's final. Wagner, Kitty Brucknell, Diva Fever, Rylan Clark and 2 Shoes will return to the show as part of big plans to mark the singing contest's tenth anniversary, The Sun reports. Wagner, Rylan Clark, Kitty Brucknell The celebration on 15 ...