Music mogul Simon Cowell is so obsessed with his appearance he wears a wig, according to pal Louis Walsh. Walsh accuses Cowell of being vain and insists he will never undergo surgery like his co-judges on hit British TV talent show The X-Factor. He says, "Sharon (Osbourne) and Dannii (Minogue) have had so much - nips, tucks, everything. "I think even Simon's had it done this year. He looks so different from last year. He hasn't got a single line or gray hair! I think it's a wig. It never moves!"