Katy Perry's Grammys fashion is under the spotlight. But, her gold Zac Posen gown isn't the only one that's got tongues wagging. Our LA reporter, Diem Brown, is taking a look at how metallic seems to be the biggest trend on the red carpet, with stars like Taylor Swift and Colbie Caillat sporting the glitzy look. Not all stars, like Rihanna, are following trends though. See why she, and a host of others, are making their own fashion mark. www.sky.com/showbiz