Pussycat Dolls star Nicole Scherzinger has praised 'X Factor' judge Louis Walsh, describing him as "the sweetest thing".

Speaking to Perez Hilton, she said of her time as a guest judge on 'The X Factor': "I really enjoyed the experience."

"It was kind of crazy. It was just a lot of fun. Simon Cowell was just brilliant and Louis was just the sweetest thing ever and lovely."

She also said that she was apprehensive before judging on the show, explaining: "I was like, 'What's this going to be like? Am I going to suck?' because I'm much more comfortable on stage being on stage than in the judges' position."