is terrified of having close friend change his long standing screen look - for fear of her dressing him in rhinestones. revealed that has ducked the opportunity to ditch his favoured items of t-shirt and jeans alongside her for almost a decade. Cowell has in fact not altered his telly look since he first appeared on our screens as a judge in 2001's Pop Idol.

Entrepreneur Klum boasts a formidable career in fashion having designed shoes for Birkenstock, clothing for Jordache, jewelry for Mouawad, a Victoria's Secret lingerie line and a men's clothing line for German mail-order catalog called Otto. However, her co-star and show boss Cowell doesn't trust his style icon pal to "razzle dazzle" his image. Speaking exclusively on video on the red carpet at AGT in Hollywood, Klum revealed she has "tried many times" to upgrade his look.

She said: "I said, 'why don't we go shopping?' He always thinks that I want to put him in something silly, which is not true. I just want to get a little variety. And it's not that I don't love what he wears.

It's simple. He is a T-shirt and pants, but there's nothing a little razzle dazzle." She continued: "And I want him a little razzle dazzle, but he thinks, when I say razzle dazzle, I think he's worried that I'm going to put him in rhinestones head to toe, which I totally don't want to do.

I just want some variety in the closet and on our desk. But he's not there for it." Klum, who is famous for hosting the most famous celebrity Halloween party in t.