The worst – and least – dressed at the Grammys: in pictures

This definitely contravenes the CBS code: Toni Braxton shows off her award for best female R&B vocal performance and her revealing outfit, at the Grammy awards in 2001 Photograph: Mark J. Terrill/AP

Jennifer Lopez takes a plunge in Versace at the 42nd Grammy awards. Unfortunately this outfit would be censored by CBS for showing 'bare sides or under curvature of the breasts' Photograph: S. Granitz/WireImage

Voulez vous? Christina Aguilera, Mya, P!nk, and Lil' Kim perform Lady Marmalade during the 44th Grammy awards, simultaneously breaking several CBS codes at once Photograph: Kevork Djansezian/AP

Lil' Kim works a problematic 'thong-type' dress at the 46th Grammy awards Photograph: Kevin Winter/Getty Images

A pregnant MIA performs in a Henry Holland dress at the 51st Grammy awards. CBS has offered no stipulation on how one should correctly conceal a bump Photograph: Robyn Beck/AFP/Getty Images

Fergie would probably test the 'adequately covered' rule in this orange number at the 54th Grammy awards Photograph: Dan MacMedan/WireImage

Rihanna arrives at the 54th Grammy awards. This may be the last time you see those fleshy under curves on the Grammy red carpet, people Photograph: Dan MacMedan/WireImage