UPDATE 1-Kelly Rowland, Paulina Rubio join U.S. 'X Factor' judges panel
May 20, 2013 at 21:49 PM EDT
LOS ANGELES, May 20 (Reuters) - Pop singer Kelly Rowland and Mexican singer-actress Paulina Rubio have signed onto "The X Factor" judging panel replacing Britney Spears and music mogul L.A. Reid, the Fox television talent competition produced by Simon Cowell said on Monday.