Britney Spears has achieved an unenviable Number One spot - on an annual Hollywood worst-dressed list.
Style guru Mr Blackwell's list described the singer as someone who had gone from "princess of pop to the ultimate fashion flop".
"When it comes to couture chaos, this tacky terror should take a bow - looks like an over-the-hill 'Lolita'," said Blackwell, who has compiled the list of the rich and famous for 46 years.
Spears has featured regularly over the past five years.
"From overexposed, underdressed and over-the-top Pop Tarts to the beyond-bad bling-bling brigade, the fashion landscape was littered with a litany of taste-free terrors," said Blackwell of 2005.
He also directed his wrath at Paris Hilton ("yesterday's cheesecake"), Jessica Simpson ("cut-rate Rapunzel slingin' hash in a Vegas diner"), Lindsay Lohan ("drowning in grown-up groaners") and Renée Zellweger ("painted pumpkin on a pogo stick").
He said that the women on his list should try and emulate the "effortless beauty and memorable style" of, among others, Nicole Kidman, Reese Witherspoon, Scarlett Johansson and Kate Moss.
The full 'Top 10' list:
1) Britney Spears
2) Mary-Kate Olsen
3) Jessica Simpson
4) Eva Longoria
5) Mariah Carey
6) Paris Hilton
7) Anna Nicole Smith
8) Shakira
9) Lindsay Lohan
10) Renée Zellweger
