The latest fashion trend in Hollywood: cobwebs? At least, that's what the sexy backs of Gwen Stefani and Miley Cyrus look like they're covered in, but it's actually Obesity and Speed's thrashed top. The No Doubt frontwoman rocked her striped version of the nonshirt with baggy pants and a bright blue bra this weekend.

"Can't Be Tamed" Miles showed a little less skin when she wore her gray top with a blue, cropped camisole and paint-splattered skinny jeans back in January. Who pulls off this wild style—if at all—the mother of two or the 17-year-old starlet?