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Louis blasts Tulisa's bleach blonde hairdo

X FACTOR star Louis Walsh has welcomed his fellow judge Tulisa's return to her dark roots -- and blasted her bleach job as "awful".

Chart star Tulisa Contostavlos unveiled a blonde hairdo in July as she attended a High Court hearing as she pursued legal action against an ex-boyfriend over a leaked sex tape.

But she went dark again this week as she prepared for the live stages of the X Factor which begin tonight.

Speaking about the N-Dubz star on ITV's Lorraine, Walsh said: "She's great, I love her and she's looking really well.

"She's got the black hair back again, she's looking much better. That blonde thing has gone. It was awful."

Walsh has previously described Tulisa as a "chav in a tracksuit" and he reiterated that.

"She is a chav in a tracksuit. Well, you know what -- she's a nice chav and she's got a nice tracksuit. I love her, I love Tulisa. It's a term of endearment."

He also took a pop at show boss Simon Cowell's hairstyle.

Walsh said: "Simon has a very unusual haircut, hasn't he? It's very square."